对于钻床，下列描述不正确的是（）。A、严禁戴手套操作钻床 B、

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问题单项选择题

对于钻床，下列描述不正确的是（）。

A、严禁戴手套操作钻床

B、钻床工件上绕有长切屑时，未停车前不得用手拉，可以用铁棒敲击

C、工作前，要对钻床、工具、夹具和量具进行全面检查

D、工作结束后应降低横臂至最低位置

答案

参考答案：B

听力题

小题1:We had a lot of fun _______ (sing) in the classroom.

小题2:She decided ________ (buy) the red dress.

小题3:This sound made the baby ________ (cry).

小题4:Most boys enjoy _______ (play) football after school.

小题5:The shop is always ______ (crowd) on weekends.

小题6: Would you like _____ (go) shopping with me?

小题7:I saw a little girl ______ (look) for her parents on the street when I walked across it.

小题8:______ (be) you at the shop last Friday?

小题9:The boy spends a lot of time ________ (practice) the piano in the room.

小题10:Look! Who _______ (stand) near the door?

单项选择题

为清晰地显示较肥胖患者肝内门静脉的彩色血流信号，应首选（）。

A.2MHz---3.5MHz探头

B.5MHz---7.0MHz探头

C.7.5MHz---10.0MHz探头

D.12MHz探头

E.14MHz探头