【名词&注释】
表面粗糙度、柴油机(diesel engine)、说明书(specification)、可燃混合气(combustible mixture)、机动船(motor vessel)
[单选题]The scuppers should be plugged____ .
A. only if fixed containment is not used
B. only if portable containment is not used
C. only if fixed containment drains are open
D. whenever the vessel is being bunkered
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举一反三：
[单选题]须给他船让路的船舶包括________①交叉局面中的让路船；②对遇局面中的机动船(motor vessel)；③规则18条规定的让路船；④规则19条听到他船一长两短声号的机动船(motor vessel)；⑤追越中的追越船。
A. ①－⑤
B. ②－⑤
C. ①③⑤
D. ①③④⑤
[单选题]柴油机缸内燃烧的物质是()
A. 空气
B. 燃油
C. 氧气
D. 可燃混合气
[单选题]At least ___ cylinders in four--stroke engine will be configured to ensure that the engine can started with the crankshaft at whatever position.
A. 6
B. 2
C. 12
D. 8
[单选题]With reference to a two-ram actuating mechanism, which one of the following statement is FALSE?
A. The rams work inside cylinders.
B. The cylinders have glands sealing their open ends.
C. The rams are connected to a cross-head
D. The cross-head is mounted on the rudder stock
[单选题]外购成品活塞和配制活塞的尺寸、形状、位置精度和表面粗糙度等均应符合______要求
A. 说明书
B. 规范
C. 设计图纸
D. 船东
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