联动机减速箱轴承外圆与座孔应是（）配合。
A.动
B.过渡
C.过盈
D.间隙
参考答案：C
A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.
A．may have been
B．must be
C．need have been
D．might be
预测的基本原则是什么？
