问题
单项选择题
快速熔断器是防止晶闸管损坏的最后一种保护措施，当流过（）倍额定电流时，熔断时间小于20ms，且分断时产生的过电压较低。
A.8
B.6
C.5
D.4
答案
参考答案：C
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快速熔断器是防止晶闸管损坏的最后一种保护措施，当流过（）倍额定电流时，熔断时间小于20ms，且分断时产生的过电压较低。
A.8
B.6
C.5
D.4
参考答案：C
| 选词并用其适当形式填空。 | |
2. Bill has three ________. One is new and the other two are old. 3. His uncle ________ very young but he is over forty. 4. Let's ________ basketball after class. 5. Look! The cats are ________ up the trees. 6. The shop isn't open. It's ________. 7. My brother ________ some new picture books. 8. In our classroom there is a large map of ________. 9. Mum, please give me something to ________. I'm very hungry. 10. Does Mr Green like ________ in this Chinese school? |
