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问题 多项选择题

常用冷作模具钢常具有（）、抗磨损的特点。

A.高碳低合金

B.抗冲击

C.耐热性

D.抗拉性

E.易脆

F.易裂

答案

参考答案：A, B

单项选择题

The enrollments at College X and College Y both grew by 8 percent from 1980 to 1985. If the enrollment at College X grew by 800 and the enrollment at College Y grew by 840, the enrollment at College Y was how much greater than the enrollment at College X in 1985 ？（）

A.400

B.460

C.500

D.540

E.580
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多项选择题

门静脉高压的重要临床表现有（）

A.外周静脉压力增高

B.腹壁静脉扩张

C.脾大

D.食管静脉曲张

E.柏油样粪
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