剖分式向心滑动轴承的()能够调整。
A.轴承座的高低
B.轴瓦与轴颈之间的间隙
C.连接螺栓的松紧
D.轴承轴的位置
参考答案:B
.There was a nice little present for everyone, with a suitable card_____.
A.attached
B.attaching
C.to attach
D.being attached
货币的本质是( )
A.商品
B.贵金属
C.一般等价物
D.价值