【名词&注释】
塑性变形(plastic deformation)
[单选题]水润滑艉轴铜套常见的失效形式有()。
A. 过度磨损和腐蚀
B. 裂纹和过度磨损
C. 腐蚀和裂纹
D. 套合松动
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学习资料:
[单选题]液压拉伸器是利用油压使螺栓()后轻易地上紧或松脱螺栓。
A. 受拉
B. 产生变形
C. 产生弹性变形
D. 产生塑性变形
[单选题]转舵时声音异常可能是()。
A. 舵承间隙过大
B. 舵承间隙过小
C. 舵杆变形
D. 舵杆折断
[单选题]For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through ().
A. the cylinder cover
B. the bottom of bed-plate
C. the sump
D. the crankcase door
[单选题]The main bearing metal is a lining ().
A. inside the bearing
B. outside the bearing
C. covering the crankshaft
D. none of the above
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