交际运用

A: Many new animals（动物园） are in the zoo（动物园）. Do you know?

B: Oh? ___小题1:___

A: Pandas（熊猫）, lions（狮子）, monkeys, giraffes and dolphins.

B: Let’s go and see them.

A: OK. _____小题2:______

B: I want to see pandas first.

A: ____小题3:____

B: Because they are very cute. ___小题4:____

A: I like dolphins.

B: ___小题5:_____

A: Because they are clever and cute.

线路运行中，档距内三相导线各相导线弧垂相差不应超过（）。

A、50mm

B、150mm

C、500mm

D、800mm