运行中的六氟化硫断路器灭弧室气室的微水量（20℃）不得大于（）微升／升。
A.150
B.300
C.250
D.500
参考答案：B
It was _______the old clock that the old man spent the whole morning at home.
A,repairing B,to repair C,repaired D,repair
I'm 160cm tall. I'm ___________ than my young brother.[ ]
A. older
B. taller
C. longer
