问题
单项选择题
气动调节阀当信号压力增加，阀杆向下移动，阀芯与阀座之间的流通面积增大的是（）。
A、正作用风关阀
B、正作用风开阀
C、反作用风关阀
D、反作用风开阀
答案
参考答案：B
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气动调节阀当信号压力增加，阀杆向下移动，阀芯与阀座之间的流通面积增大的是（）。
A、正作用风关阀
B、正作用风开阀
C、反作用风关阀
D、反作用风开阀
参考答案：B
| 阅读短文，选择合适的内容填空。 | |||
| Mrs Brown was an Australian woman. She ___l___ in a small town near a big farm. One Friday afternoon, after she finished her___ 2____,she____3____to her farm. There____4___ many cows, horses and small animals____5___her farm. She liked to see these animals. Suddenly she__6___ a kangaroo under her window. The interesting thing was____7___ an old jacket. Mrs Brown____8__ some bread and water to it. The kangaroo.__9____very happy. And Mrs Brown was happy,too. On the next morning,Mrs Brown____10___ to her farm again. To her surprise,she saw more than 100 kangaroos under her window! | |||
| ( )1. A. lives ( )2. A. homework ( )3. A. went ( )4. A. was ( )5. A. in ( )6. A. sees ( )7. A. wear ( )8. A. giving ( )9. A. is ( )10. A. going | B.lived B.studying B.goes B.are B.at B.saw B.wears B.eat' B.was B.went | C.living C.exercise C.go C.were C.with C.see C.wearing C. ate C.were C.goes | D.live D.housework D.going D.is D.on D.seeing D.wore D.gave D.are D.go |