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单选题
If a line at right angles to the axis rotates about that axis and, at the same time, moves parallel to the axis, it will generate （）.
A
a helix
B
a helicoidal
C
a curve
D
a cone
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单选题（）leads at right angles to the center line from the stern to the shore.A
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An aft springC
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bow lineB
breast lineC
spring lineD
stern line
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单选题（） connected to the moving tiller will bring the floating lever pivot and the lever into line at right angles to the screw shaft axis.A
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单选题A Chinese stopper (two lines) will hold best when you（）.A
fasten the bitter ends to the mooring line with half hitchesB
twist the ends together and hold them in the direction of the pullC
twist the ends together and hold them in the direction opposite to the pullD
twist the ends together and hold them at right angles to the mooring line
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单选题When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes （）.A
a lineB
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windlassesB
drumsC
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单选题Flexible hose under pressure in a hydraulic system will （）.A
tend to twist about its long axisB
expand in length and in diameterC
contract in length and expand in diameterD
flex at right angles to the applied pressure
考题
单选题In any right triangle, the acute angles are ______.A
EqualB
Adjacent anglesC
Vertical anglesD
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考题
单选题In a married falls rig at the after end of a hatch，a boom is rigged in a fore and aft line through its heel.Stresses on the outboard guy will be LEAST if the guy is made fast at a point（）.A
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单选题The distance a vessel moves at right angles to the original course，when a turn of 180°has been completed，is called the（）.A
advanceB
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kick
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单选题In a married falls rig at the after end of a hatch , a boom is rigged in a fore and aft line through its heel . Stresses on the outboard guy will be least if the guy is made fast at a point（）.A
abreast the heelB
at right angles to the boom when viewed from aboveC
aft of the heelD
forward of the spiderband
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