问题
单项选择题
根据作用原理化工用泵包括（）。
A、容积泵
B、叶片泵
C、流体作用泵
D、A和B、C
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
根据作用原理化工用泵包括（）。
A、容积泵
B、叶片泵
C、流体作用泵
D、A和B、C
参考答案：D
| 补全对话。 根据对话情景和内容，从对话后所给的选项中选出能填入空白处的最佳选项。 | |
| — Can you help me? — Sure, what's the problem? — 1 — Well, how about San Francisco? We went there last year and had a great time. — 2 — Well, there is Golden Gate Bridge of course, and Golden Gate Park. It's a really big park. You can go for long walks or take a rest in the Japanese Tea Garden. It's beautiful there. — 3 — There is also a place called Fisherman's Wharf. That's really popular with tourists. There are lots of shops, cafes and restaurants. And from there you can go on a boat trip to Alcatraz. You know, it's a small but very beautiful island. — 4 — No, you can't stay on the island; there aren't any hotels. You can only go for the day. I think I've still got a book about San Francisco. I can lend it to you. — 5
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