【名词&注释】
螺杆泵(screw pump)、运动副(kinematic pair)、责任事故(liability accident)、一日三餐
[单选题]运动副磨合良好可使摩擦表面的实际接触面积增大，可达( )以上。
A. 40%
B. 60%
C. 80%
D. 100%
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举一反三：
[单选题]If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).
A. a broken shaft on the freshwater pump
B. an excessive accumulation of scale in the heat exchanger
C. an incorrect thermostatic element operating range
D. lube oil in the cooling water
[单选题]一般螺杆泵直径越大，其他条件不变，则容积效率( )。
A. 越高
B. 越低
C. 不受影响
D. 都有可能
[单选题]The magnetic field is provided by electromagnets so arranged that adjacent poles have ___.
A. opposite polarity
B. the same polarity
C. negative polarity
D. positive polarity
[单选题]海上遇难获救后体力未恢复、正确的饮食方法：
A. 一日三餐
B. 流质饮食
C. 半流质饮食
D. 普食
[单选题]Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.
A. Orsat apparatus
B. flame safety lamp
C. Halide torch
D. combustible gas indicator
[单选题]机损事故分为________。
A. 船员责任事故
B. 非船员责任事故
C. 船员责任事故和非船员责任事故
D. 船员责任事故或非船员责任事故
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