【名词&注释】
轴系理论中心线、不一定(not always)
[单选题]根据轴系理论中心线,将轴系各轴承的中心线布置成一条直线,这一过程称为()。
A. 直线校中
B. 按轴承允许负荷校中
C. 合理校中
D. 轴系校中
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学习资料:
[单选题]按轴承允许负荷原理校中时,各轴承的连线是()。
A. 直线
B. 曲线
C. 折线
D. 不一定
[单选题]艉轴铜套的长度一般不超过()mm,否则应分段制造。
A. 500~800
B. 500~1000
C. 600~800
D. 600~1000
[单选题]In the four-stroke engine, it takes () to make one power stroke.
A. one propulsion
B. two propulsions
C. two revolutions
D. one revolutio
[单选题]It is necessary to remove () from the cooling spaces.
A. scar
B. scale
C. spur
D. bilge
[单选题]The injector pump is operated by a cam which drives the plunger ().
A. top and bottom
B. to and fro
C. up and down
D. back and forth
[单选题]If you don’t understand the meaning of the technical terms of the diesel engine, you can () the dictionary of machine technology.
A. look for
B. find out
C. consult
D. read
[单选题]The minimum speed an engine must attain before ignition can occur depends upon ().
A. the type and size of the engine
B. the condition of the engine
C. ambient temperature
D. all of the above
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