题目内容

[音频]Section DSpot dictation. Listen to the following short passage, then fill in the blanks with the missing words or phrases. The passage will be read three times.Looking for an apartment can be a difficult job. The first thing to (16) ___________ is how much money you can spend. You can not rent a home if it’s too (17) ___________. Secondly, where the home is located is also important. You don’t want a home too (18) ______ from work. You might want to spend a little more money to be closer to your office. Anyway, before you look for a place to live in, you should (19) _________________________________________Of all the things you want and need. This will be easier for you to make the (20) __________________________________________.

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齿轮式机油泵一般是( )啮合

A. 内
B. 外
C. 齿轮
D. 行星轮

转子式机油泵一般是( )啮合

A. 内
B. 外
C. 行星轮
D. 齿

转子式油泵的内转子比外转子( )齿

A. 少
B. 多
C. 相等

机油泵的作用是()

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