问题
单项选择题
电力拖动由（）、传动机构和控制设备等基本环节组成。
A.电动机
B.发电机
C.内燃机
D.变压器
答案
参考答案：A
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电力拖动由（）、传动机构和控制设备等基本环节组成。
A.电动机
B.发电机
C.内燃机
D.变压器
参考答案：A
| 用所给词的适当形式填空。 | |
2.The bed was so comfortable that he soon fell _____. 3.The students were talking _____ when the teacher came in. 4.Summer is the best season for _____. Let's go to Qingdao together 5.Don't be _____. If you work hard, you'll pass the exam. 6.I like many colours, _____ red, blue and white. |