题目内容

工具钢主要用来制造各种刃具、模具、量具等,主要性能要求:具有较高的硬度及足够的韧性和塑性。

A. 对
B. 错

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指出下列合金牌号的代表的含义T10A Q215-AF 45 QT500-7 H80

n. the state of being important or well known重要；知名

A. prominent
B. prominence
C. magnificence
D. publicity

vt. compete for sth, or try to win it竞争；争夺；角逐

A. contract
B. assert
C. contest
D. smash

present somewhere, often at an important or official event 出席（重要的或官方的活动）

A. might as well
B. give away
C. in attendance
D. endure sb. to sb.