单项选择题

滚动轴承安装前要根据轴承的大小、类型、结构和( )情况，准备好所需的量具和工具

A.精度
B.配合
C.尺寸
D.形状

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单项选择题

The burning of fuel oil in a diesel engine having a high sodium content, will cause ＿.
A.corrosion and grooving of exhaust valves
B.corrosion and gumming of the fuel injection pump
C.salt deposits in the exhaust manifold
D.slag deposits in the fuel injection equipment

A.
A.corrosion
B.corrosion
C.salt
D.slag

单项选择题

管子的热弯,管子加热长度为弯管长度的12倍左右,加热时应反复滚动管子,以保证其受热均匀,一般碳钢管加热温度()。

A.350〜400℃
B.450〜550℃
C.600〜800℃
D.950〜1000℃