液压缸按液压作用性质,可分为()式液压缸和双作用式液压缸。
A、直线往复式
B、摆动式
C、单作用式
D、柱塞式
参考答案:C
通读下面的对话,然后根据上下文补全对话内容。
A: Have you (1) r_________ today's newspaper?
B: No, I haven't. (2) W_________ there any important news?
A: There's a (3) r_________ about the population of our country. It says we have got another 16,000,000
people this year.
B: Oh, the population is growing faster and (4) f______.
A: If the population goes on (5) g________, it will be the (6) b________ problem in our country.
B: Of course. The population of the babies born in one year in China is (7) a________ as large as the population
of Australia.
A: I'm afraid there will be only (8) s________ room for us some day.
B: But if every family has only (9) o________ baby, things will turn (10) b________.
某人画了一副《孔子编书图》,图中内容有历史错误的是 ( )
①房间里面烧着木炭取暖
②墙上挂着一柄铜剑
③墙上挂着“兰亭序”
④墙上用楷书写着“仁者,爱人”
A.①②③
B.③④
C.②④
D.①④