【名词&注释】
冷却液(coolant)、障碍物(obstacle)、增压器(turbocharger)、曲轴箱(crankcase)、救生艇(boat)、动力源(power source)
[单选题]Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to _____________.
A. higher speed required
B. flywheel-effect
C. lower starting temperatures
D. higher compression pressures
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举一反三：
[单选题]若客船海水泵的动力源(power source)为电力时，则动力源(power source)为_____。
A. 2套主发电机
B. 2套应急电源
C. 1套主发电机和1套应急电源
D. 2套应急发电机
[单选题]柴油机气缸发生拉缸时的征兆是( )。Ⅰ.排温升高，冒黑烟;Ⅱ，转速升高;Ⅲ.柴油机冷却液出口温度升高;Ⅳ.曲轴箱，扫气箱温度升高。
A. Ⅰ+Ⅱ
B. Ⅱ+Ⅲ
C. Ⅲ+Ⅳ
D. Ⅰ+Ⅳ
[单选题]救生艇(boat)手提电台能自多少米投入水中不损坏且浮于水面：
A. 15m
B. 18m
C. 20m
D. 10m
[单选题]If anything abnormal be found on the load change of main engine when the ship is entering in shallow waterway, before taking measures the engineer on duty should _______.
A. stop main engine immediately
B. ask the captain and the chief engineer's permission for stopping the engine
C. inquire the bridge for the situation initiatively
D. stop engine and inform bridge
[单选题]在航不对水移动中从事疏浚作业的船舶，操纵能力受到限制时，在夜间应显示＿＿＿＿。
A. 红、白、红垂直三盏环照灯
B. 可通过的一舷，垂直两舷盏环照红灯
C. 存在障碍物一舷，垂直两盏环照绿灯
D. 红、白、红垂直三盏环照灯，桅灯、舷灯、和尾灯
[单选题]增压器压气机采用半开式径向叶轮的优点是( )。
A. 强度好，制造工艺简单
B. 允许有较高的轮缘速度
C. 能获得较高的增压压力
D. 以上三点都是
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