电力网按供电范围的大小和电压高低可分为()。
A.低压电网、高压电网、超高压电网
B.低压电网、中压电网、高压电
C.低压电网、高压电网
D.压电网、中压电网、配电网
参考答案:A
用所给单词的适当形式填空。
1. Let’s _____ (sing) this song together.
2. Sam doesn’t want _____ (clone).
3. Scientists can even _____ (combine) a plant and an animal.
4. Try _____ (make) a funny story
5. I think it would be fun _____ (clone)myself.
前下视野法规角度应大于多少度?()
A.5
B.6
C.7
D.10