连锁回路是由几个操纵阀分别控制几个液压缸,应用连锁回路,使它们的动作相互联系或相互制约,防止()引起的不良后果。
参考答案:因误操作
缺词填空
Last Wednesday, Mr Chen took his class 1 the Space Museum. There were many things 2
space there. First, the children saw a film about space travel.
They saw how this space shuttle took off in space and later 3 on the earth again. It was very
exciting and the children felt they were travelling in space 4 .
After the film, Mr Chen took 5 to see some models of rockets 6 the space shuttle. The models
looked very real, but they were much 7 . Then the children saw some moon rocks, Two 8 landed on
the moon in 1969. They put an American flag there. Then they took some rocks back to the 9 .
Before the children left, they also watched a video show about people 10 and working in a space
lab. The people could stay in the space lab for months.
こんな難しい問題、君なんかにできっ()。
A.ない
B.たっけ
C.こない
D.そう