单项选择题

Shims of different thicknesses are inserted between the shells to enable adjustment of （）.

A.the bearing clearances
B.the bearing thickness
C.the bearing strength
D.the bridge hardness

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单项选择题

A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs

单项选择题

A.low specific heat
B.high specific heat
C.corrosive action
D.high viscosity

单项选择题

A.low specific heat
B.corrosive action
C.high expense
D.acid property