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[单选题]柱塞套筒进行滑动试验时,一般将柱塞抽出()配合面长度。
A. A.1/5
B. B.1/4
C. C.1/3
D. D.1/2
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[单选题]大型海船艉轴工作轴颈较长,所包覆的铜套过长,加工和安装均不便,故将铜套分段加工、套合,但必须保证()的水密性。
A. 铜套铸件
B. 安装
C. 接缝处
D. 套合
[单选题]舵杆工作表面过度磨损可以采用()修复。
A. 光车
B. 堆焊后光车
C. 喷涂后光车
D. 镀铬
[单选题]In the () pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.
A. constant
B. pulse
C. high
D. none of the above
[单选题]The gas loads on the engine structure are constrained by means of hydraulically preloaded () which connect the bed plate, frame sections and cylinder jackets into a single unit.
A. connecting rods
B. main bearing
C. column
D. tie rod
[单选题]The term () refers to one complete sequence of operations required to produce power in an engine.
A. diesel engine
B. stroke
C. cycle
D. compression ratio
[单选题]A fuel-air mixture below the lower explosive limit is too().
A. rich to burn
B. lean to burn
C. cool to burn
D. dense to bur
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