SF6断路器只利用SF6作为灭弧介质的。
参考答案:错
We students shouldn't spend _____ time on the Internet. [ ]
A. too many
B. many too
C. much too
D. too much
任何物体都能分割为极小的粒子,这是物质的可分性,如将一块糖进行若干次的分割,但保持其甜味的,可分为的最小粒子是_____.