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单选题
The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A
direction of air flow within the cylinder
B
sequence of port opening
C
method of opening exhaust ports
D
volume of air admitted to the cylinder
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单选题What does the command show | compare rollback 1 display?（）A
the difference between the current candidate configuration and the candidate configuration from one commit agoB
the difference between the current active configuration and the current candidate configurationC
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单选题The maximum difference between mean time and apparent time is （）.A
equal to the longitude expressed in time unitsB
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15°of arc
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单选题Which of the following definitions can be used to define the term ‘offset ’ as a characteristic of controller action?（）A
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单选题What does the command show | compare rollback 1 display?（）A
the difference between the current candidate configuration and the candidate configuration from one commit agoB
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单选题Forces within a vessel have caused a difference between the starboard and port drafts. This difference is called（）.A
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单选题The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）A
direction of air flow within the cylinderB
sequence of port openingC
method of opening exhaust portsD
volume of air admitted to the cylinder
考题
单选题Magnetic compass deviation（）.A
varies depending upon the bearing usedB
is the angular difference between magnetic north and compass northC
is published on the compass rose on most nautical chartsD
is the angular difference between geographic and magnetic meridians
考题
单选题In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.A
produce a scavenging effect in the combustion spaceB
equalize cylinder and exhaust manifold pressuresC
alleviate the difference in valve size between the intake and exhaustD
flush out condensate that collects after each compression stroke
考题
判断题For Krashen, the affective filter is the principal source of individual difference in second language acquisition.（）A
对B
错
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