问题
单项选择题
千伏真空断路器的行程为（）。
A.20～30mm
B.10～20mm
C.8～12mm
D.4～8mm
答案
参考答案：C
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千伏真空断路器的行程为（）。
A.20～30mm
B.10～20mm
C.8～12mm
D.4～8mm
参考答案：C
| 完型填空。 | ||||
| Rosa and Mary are neighbours. They often 1 things from each other. But Rosa often borrows Mary's car, money and other expensive (贵重) things. She 2 borrow cheap things. One day, again, she asked Mary, " Mary, could I use your piano please? I have to practice it for the 3 test." Mary said: " 4 , dear Rosa. My son practices it _5 ." "I can give 6 my guitar, let him _7_ it these days." "Oh no, Rosa. My son might break (损坏) your 8 " "It doesn't 9 , my son might break your_10 , too. | ||||
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