问题
单项选择题
存放时，两个磁控管之间的间隔距离至少为（）厘米.
A、10
B、20
C、30
D、50
答案
参考答案：B
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存放时，两个磁控管之间的间隔距离至少为（）厘米.
A、10
B、20
C、30
D、50
参考答案：B
| 根据对话内容，选择恰当的句子补全下列对话。 | |
| A: Hi, Mr. Liu. 1. _____ B: Of course. A: As a member of Greener World. Do you like working there? B: 2. _____ A: How long have you been there? B: 3. _____ A: What's your main job? B: 4. _____ A: What can students do at school? B: 5. _____ A: It's very kind of you. Thank you. | |
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