（）因奥氏体的溶碳或溶入其他合金元素的能力，所以，它又是渗碳

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问题单项选择题

（）因奥氏体的溶碳或溶入其他合金元素的能力，所以，它又是渗碳体和其他化学热处理的基础。

A.随着温度的升高而降低

B.随着温度的降低而增加

C.随着温度的升高而增加

D.不受温度变化的影响

答案

参考答案：C

填空题

用动词的适当形式填空

Yesterday Tom had no work to do after lunch. So his father asked him (1)__________(go) to the

bookstore to buy a few books. He (2)__________(hurry)to the bus stop and arrived there at three.

When he (3)__________(wait) for a bus, he saw a little dog. It (4)__________(go) across the street.

Just then a car (5)__________(come), driving fast. But it (6)__________(be) too late. The dog

(7)__________(fall) down and (8)__________(not move).

"Poor dog!" he cried .But look! Suddenly it (9)__________(stand) up and went away.

He was very glad (10)__________(find) it was safe.

单项选择题

在债的关系中( )。

A．债权人、债务人都是特定的
B．债权人、债务人都不是特定的
C．债权人是特定的，债务人是不特定的
D．债权人是不特定的，债务人是特定的