If your propeller is racing in rough weather，you should（）.

[试题]very rough estimate选择It__________accordingtowhereyoulive,andthisisaveryroughestimate[A]shifts[B]converts[C]modifies[D]varies

[单选题]C．ompared to a constant pitch propeller, a controllable pitch propellerA．more efficiently uses available engine powerB．operates at a lower efficiency at a fixed speedC．produces the same torque at lower engine powerD．develops its rated power at a lowe

[单选题]A． controllable pitch propeller on a diesel driven vessel eliminates the need forA．friction clutchesB．disconnect clutchesC．reversing gearsD．reduction gears

[单选题]A variable pitch propeller is made （） a boss with separate blades mounted into it.A . ofB . up ofC . fromD . out

[单选题]A． sketch B rough C preliminary D improper

[单选题]A．) sketchB．) roughC．) preliminaryD．) draft

[单选题]“Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired, or at least patched up temporarily until the next stop” This sentence means that （）.A . Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaire

[单选题]Where a propeller shaft passes through the hull，water is prevented from entering by means of a（）.A . stuffing boxB . propeller bossC . seacockD . stop-water

[单选题]在高尔夫术语中，“Rough”的意思是（）。A . 浅草区B . 障碍区C . 沙坑D . 粗草区

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termedA．apparent slipB．true slipC．pitchD．propulsive efficiency