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單項(xiàng)選擇題

When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes （）.

A.a line
B.a circle
C.a helix
D.an epllicate

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單項(xiàng)選擇題

An emergency bilge pumping system is provided and should be （） of the main bilge pumping system, according to the SOLAS 74 Convention.

A.dependent
B.in dependent
C.in series
D.in parallel

單項(xiàng)選擇題

The fire pumps must be capable of delivering a total quantity of water at a defined head, not less than （） of the total bilge pumping capacity.

A.one-third
B.two-thirds
C.one-fourth
D.two-fourths