闭环数控机床的检测装置，通常安装在伺服电机上。（）
参考答案：错
两个数的最小公倍数是252，最大公约数是7，并且两个数中的大数不是小数的倍数，则这两个数是______．
---Hi. Lucy! What’s wrong with you? You look so worried.
---I have many problems to solve, but I don’t know ___________ first.
A．how to deal with
B．when to deal with
C．what to deal with
D．how to do with
