题目内容

在含有3个有效结点的链表中，________

A. 有唯一一个结点没有前趋
B. 有唯一一个结点没有后继
C. 有唯一一个结点既没有前趋也没有后继
D. 有唯一一个结点既有前趋也有后继

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链表的各个结点________

A. 必须依次连续存放
B. 必须具有相同的类型
C. 允许表中较后面的结点时安排在地址较小的位置
D. 至少含有一个指针域

[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) ____.

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