问题：
[单选] What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）
375 RPM。500 RPM。750 RPM。1500 RPM。
问题：
[填空题] 摇动兆欧表后，各接线柱之间不能（），以免损坏。
问题：
[单选] GSK983进行DNC方式操作时，方法是进入（）
通讯方式，任意选择程序号输入。通讯方式，选择100号程序输入。自动方式，选择100号程序输入。自动方式，任意选择程序号输入。
问题：
[单选] “Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）
by using of fresh water。with compressed air。by using of sea water。with chemical compound。
问题：
[单选] “Stand by an engine” means （）
“prepare to stop the engine”。 “assemble an engine on its bedplate”。 “make an engine ready for starting”。 “dismantle an engine&rdquo。
问题：
[单选] A （）is the foundation of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.
Frame。Bedplate。Cylinder。Liner。
问题：
[单选] （） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.
Bulbs。Bulks。Flyweights。Flywheel。
问题：
[单选] （） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
Doors。Aspirate gauzer。Coupling。Blind。
问题：
[单选] （） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.
An automatic。A transmission。A self-regulating。An interlocking。
问题：
[单选] （） fuel oils （） lubricating oils require treatment before passing to the engine.
Both；and。Neither；nor。Either；or。Both；or。
