汽蚀
参考答案:由于某种原因,使水力机械低压侧的局部压力降低到该温度下的汽化压力以下,引起气泡的发生、发生和溃灭,从而造成过流部件损坏的全过程。
根据短文内容,判断正(T)误( F)。
A young man and an old man are walking in the park. The old man is behind the young man. He is tired,
so he wants to have a rest. There is a chair in front of the young man. The old man sees the chair. He wants
to sit on the chair. He walks to the chair. The young man walks to it, too. So the old man begins to run. The
young man says, "Don't sit on the chair!" The old man doesn't listen to him. Now he is sitting on it. He looks
happy. The young man comes over to him. He is holding a small board in his hands. It says, "Wet Paint (油漆
未干)."
( )1. The young man is the son of the old man.
( )2. The old man wants to sit on the chair because he is tired.
( )3. The young man doesn't want the old man to sit on the chair.
( )4. The old man listens to the young man.
( )5. The young man wants to sit on the chair.
在现代化建设中,要整体谋划国土空间开发,尽可能()利用国土空间,减少对自然生态空间的占有。
A.减少
B.增加
C.集中集约
D.协调