A.40% B.58% C.65% D.70%
A.完好 B.缺损 C.退色 D.有污渍
A.间隙增大 B.间隙变小 C.变形 D.轴向位移
A.120 B.115 C.110 D.105
A.860 B.190 C.440 D.340
