当出现“SPEED，SPEED，SPEED”的语音警告时表示：（）

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

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

[单选题]ECAM上什么时候显示“OVER SPEED”警告（）A .在速度达到Vmo+4kt和Mmo+0.006时B .在大速度保护启动时C .有超过最大速度限制的趋势时

[单选题]What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）A . 375 RPMB . 500 RPMC . 750 RPMD . 1500 RPM

[单选题]The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel ______ within half the range of visibility.A．stoppingB．being stoppedC．to stopD．to be stopped

[单选题]The high-speed data services for the interconnection of computer networks are usually referred to as ______ connections．A．LANsB．MANsC．WANsD．ATM

[名词解释] 目标速度target speed

[单选题]Crankshafts of medium speed engines are （） from a single piece of steel.A . unusually solid weldedB . never be solid forgedC . almost invariably solid forgedD . almost invariably be welded

[单选题]In reducing engine speed to an efficient propeller speed by the use of reduction gears, _______.A．speed and torque are both reducedB．speed is reduced and torque remains unchangedC．speed is reduced and torque is increasedD．speed is sometimes unchanged

[试题]Tospeedupthe______ofletters,thePostOfficeintroducedautomaticsorting.A．)treatmentB)deliveryC)transmissionD)departure