根据有关防火规定，电动机在热状态下不能连续启动（）次。
A.6
B.4
C.2
D.5
参考答案：C
用所给动词的适当形式填空。
1. Joy ________ (like) singing. She often ________ (sing) in the concerts.
Now she is ________ (sing).
2. Holly ________ (have) a good weekend. She ________ (go) to ________
(visit) her cousin John and ________ (play) tennis.
取心钻进的几个环节是什么？
