主机在长时间停车后的起动过程中，主、辅起动阀开启与关闭的情况

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问题单项选择题

主机在长时间停车后的起动过程中，主、辅起动阀开启与关闭的情况为（）。

A.辅阀开，主阀关-辅阀关，主阀开-主阀关

B.辅阀开，主阀关-辅阀开，主阀开-主阀关，辅阀关

C.辅阀关，主阀开-辅阀开，主阀开-主阀关，辅阀关

D.辅阀关，主阀开-辅阀开，主阀关-辅阀关

答案

参考答案：B

阅读理解

阅读短文，判断正(T)误(F)。

Yesterday I walked to the park and played with my cousin, Jing. We saw many people playing happily.

Some were talking, some were walking, some were flying kites. And some were laughing loudly. Jing and I

were flying a kite. It was high in the sky. We had a good time. We also helped a little girl. She cried because

(因为) she fell and hurt her knee.

( ) 1. Yesterday I walked to the restaurant.

( ) 2. Jing is my cousin.

( ) 3. The children were talking.

( ) 4. Jing and I were flying a kite.

( ) 5. We helped a little girl.

单项选择题

可摘局部义齿固位体不具备的作用是（）

A.连接作用

B.支持作用

C.固位作用

D.稳定作用

E.间接固位作用