机械设备

被称为

淬火温度区

These stresses are liable （） occur through hammering or working the metal, or through rapid cooling.

A. to
B. with
C. for
D. on

These stresses are liable to occur through hammering or working the metal, or through rapid cooling.句中，through hammering or working the metal, or through rapid cooling.是（ ）。

A. 谓语
B. 宾语
C. 方式状语
D. 定语

We heat it （ ） beyond the critical temperature, and then quench it in water or some other liquid.

A. in
B. up
C. on
D. -

We heat it up beyond the critical temperature, and then quench it in water or some other liquid.句中，heat up 和quench是并列（ ）。

A. 同位语
B. 宾语
C. 状语
D. 谓语

The properties of tempered steel enable us to use it in the manufacture of tools, which need a fairly hard steel.句中，which引导的非限制性定语从句是用来补充说明（ ）。

A. tempered steel
B. The properties of tempered steel
C. tools
D. The properties of tempered steel enable us to use it in the manufacture of tools