题目：
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
答案：
参考答案：A
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
参考答案：A
