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单选题
The crankpins and journals were machined and matching holes bored in the webs, which were slightly （） in diameter.
A
smaller
B
larger
C
higher
D
lower
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B1i'k Holes1 Black holes can be best described as a sort of vacuum,sucking up everything in space. Scientists have discovered that black holes come from an explosion of huge stars. Stars that are near death can no longer burn due to loss of fuel , and because its temperature can no longer control the gravitational（重力的）force, hydrogen ends up putting pressure onto the star' s surface until it suddenly explodes then collapses.2 Black holes come from stars that are made of hydrogen,other gases and a few metals. When these explode it can turn into a stellar-mass ( 恒星质量）black hole , which can only occur if the star is large enough (should be bigger than the sun) for the explosion to break it into pieces,and the gravity starts to compact every piece into the tiniest particle. Try to see and compare:if a star that' s ten times the size of the sun endsup being a black hole that' s no longer than 70 kilometers ,then the Earth would become a black hole that' sonly"fraction of an inch! 3 Objects that get sucked in a black hie will always remain there,never to brsak fren. But rememberthat black holes can only gobble up（吞噬）objects within a specific distance to it It' s possible for a largestar near the sun to become a black hole,but the sun will continue to stay in place. Orbits (轨道）do notchange because the newly formed black hole, contains exactly the same amount of mass as when it was a star,only this time its mass is totally contracted that it can end up as on biggeer tnan a state. 4 So far, astronomers have figured out that black holes exist because of Albert Einstenin's theory of relativity. In the end,through numerous studies ,they have discovered that black holes truly exist. Since blackholes trap light and do not give off light,it is nearly impossible to detect black goles via a telescope. Butastronomers continue to study galaxies (银河系）,space and the solar system to understand how black holes misht evolve. It is possible that black holes can exist for millions of years,and later contribute to a biggerprocess in galaxies ,which can eventually lead to creation of new entities（实体）.Scientists also credit blackholes as helpful in learning how galaxies began to form. Paragraph 2_____________A:What Happens to the Objects Around a Black Hole?B:Is There Proof That Black Holes Really Exist? C:How Were Black Holes Named? D:What Are Different Types of Black Holes?E:What Are Black Holes Made of?F:How Are Black Holes Formed?
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考题
共用题干
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考题
Which of the following is true of an ACL when a packet matching an ACE is found?（）A、The matching ACE is skipped to allow all other ACEs to be examined.B、The matching ACE is processed and then the last ACE is examined.C、The matching ACE is processed and then the next ACE is examined.D、The matching ACE is processed and the next packet is examined
考题
What is the effect of the following access list condition access-list 101 permit ip 10.25.30.0 0.0.0.255 any（）。A、permit all packets matching the first three octets of the source address to all destinationsB、permit all packets matching the last octet of the destination address and accept all source addressesC、permit all packets from the third subnet of the network address to all destinationsD、permit all packets matching the host bits in the source address to all destinationsE、permit all packets to destinations matching the first three octets in the destination address
考题
单选题The object of plugging holes below the waterline on a ship should be to（）.A
eliminate all water entering the holeB
only plug holes in machinery or other vital spacesC
reduce the entry of water as much as possibleD
plug the largest holes first
考题
单选题The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.A
barrelB
ramC
pistonD
rod
考题
单选题What is the effect of the following access list condition? access-list 101 permit ip 10.25.30.0 0.0.0.255 any（）。A
permit all packets matching the first three octets of the source address to all destinationsB
permit all packets matching the last octet of the destination address and accept all source addressesC
permit all packets from the third subnet of the network address to all destinationsD
permit all packets matching the host bits in the source address to all destinationsE
permit all packets to destinations matching the first three octets in the destination address
考题
单选题UMS stands for（）.A
ultra much spaceB
universal medium systemC
unit machined spaceD
unattended machinery space
考题
单选题Cast iron carrier rings, （） machined grooves, are provided for all the pistons.A
caulked intoB
caulking intoC
pressed intoD
screwed into
考题
单选题Cylinder oil is a high viscosity mineral oil, with a （） machined to the anticipated sulfur content of the fuel.A
TANB
TBNC
SAND
SBN
考题
单选题Which of the following is true of an ACL when a packet matching an ACE is found?（）A
The matching ACE is skipped to allow all other ACEs to be examined.B
The matching ACE is processed and then the last ACE is examined.C
The matching ACE is processed and then the next ACE is examined.D
The matching ACE is processed and the next packet is examined
考题
单选题The diameters of the crankpins should be measured using （）.A
a micrometerB
a bridge gaugeC
a spannerD
a wrench
考题
单选题Assuming both paths shown in the exhibit are available, which statement is correct?（）A
Traffic matching the default route will use 10.1.1.1 as the next hop.B
Traffic matching the default route will use 10.1.1.254 as the next hop.C
Traffic matching the default route will be load-balanced per packet across both next hops.D
Traffic matching the default route will be load-balanced per flow across both next hops.
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