基本尺寸相同的、相互结合的孔和轴（）之间的关系，称为配合。
参考答案：公差带
找出句中错误的地方并改正。
1. Where are your baseball?
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2.—What's her bag? —It's on the sofa.
3. My bed is near wall.
4. The desks in the room.
5. Some pictures are in the wall.
6.—Is soccer under the table? —No, it under the chair.
应当先履行债务的合同一方已经掌握确凿的证据证明合同对方的经济状况严重恶化，所以先行终止了债务履行，这种权利是指( )。
A．不安抗辩权B．同时履行抗辩权C．先履行抗辩权D．后履行抗辩权
