【单选题】蝶阀主要由阀体、(A)、阀座、衬套、O型圈、阀杆及传动装置组成.
【单选题】国家介入市场、调控宏观经济运行的行为必须有法律的明确授权,并受宏观调控法实体性、程序性规范的约束。这是宏观调控法若干原则中( )的涵义。
【简答题】Bright colours on a pae make a big impact, so it seems that a lot of good studying is going on when you read and highlight.
【单选题】听力原文:W: Good evening, sir. I'm the Assistant Manager. M: How nice. W: Yes, I'm afraid we've had a complaint about the noise from your neighbor across the corridor. He's trying to get some sleep as he ...
A.
She wants to greet the man.
B.
She wants to send the man some coffee.
C.
She wants to inform. the guest of a complaint from his neighbor.
D.
She wants to join their celebration.
【单选题】截止阀主要由手轮、填料、压盖、阀杆、( )、阀体等组成。