【名词&注释】
平衡阀(balance valve)、障碍物(obstacle)、尖锐湿疣(condyloma acuminatum)、外生殖器(genitalia)、差压变送器(differential pressure transmitter)、直升飞机(helicopter)、运行时(run-time)、截止止回阀(stop check valve)
[单选题]The oil index of main engine should be controlled to prevent it from ____ in heavy weather.
A. over heat
B. over speed
C. over pressure
D. over worn
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举一反三：
[单选题]Vee-type engines have the connecting rods from two cylinders connected to each _____ of the crankshaft.
A. throw
B. web
C. main bearing
D. deflection
[单选题]Accidental flooding of the engine room bilges by the bilge main is prevented by( ).
A. stop-check valves installed in the bilge suction manifolds
B. using a positive displacement reciprocating bilge pump
C. installing educators in all bilge rose boxes
D. installing a swing check before each bilge valve
[单选题]尖锐湿疣病毒在温暖潮湿的环境中最容易繁殖，病变主要发生于______部位.
A. 尿道
B. 呼吸道
C. 外生殖器
D. 消化道
[单选题]When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is _____.
A. lagging
B. leading
C. maximum
D. minimum
[单选题]追越条款优先于：I、帆船条款；II、对遇局面条款；III、规则第19条
A. I
B. I、II
C. II、III
D. I、II、III
[单选题]为防止差压变送器发生单向过载，投入运行时(run-time)正确的操作顺序是( )。
A. 开平衡阀，开炉水阀和参考水位阀，再关平衡阀
B. 关平衡阀，开炉水阀和参考水位阀
C. 开炉水阀和平衡阀，关闭参考水位阀
D. 开炉水阀，关平衡阀，开参考水位阀
[单选题]Compared to a constant pitch propeller, a controllable pitch propeller
A. more efficiently uses available engine power
B. operates at a lower efficiency at a fixed speed
C. produces the same torque at lower engine power
D. develops its rated power at a lower speed
[单选题]直升飞机(helicopter)进行吊升的悬空高度一般是距艇筏的（）左右，吊运区周围至少（）内无障碍物。
A. 27米，18米
B. 16米，27米
C. 27米.16米
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