高压配电室的耐火等级不应低于( )。
A.一级 B.二级 C.三级 D.四级
参考答案:B
---"Can you find me a good physics teacher?"
---"Yes, I know one with ______."
A.many experiences
B.much experience
C.a little experience
D.a few experiences
下面几种动物中,哪一种是昆虫?()
A.蝎子
B.蜈蚣
C.竹节虫