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问题 单项选择题

钢材经过退火处理后，可以降低硬度，使钢的晶粒细化，消除（）等。

A.内应力

B.变形

C.表面缺陷

D.偏析

答案

参考答案：A

单项选择题

In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

Why does the speaker mention the historical sites

A. Some of them are inaccessible to beginning cyclists.
B. Some of them commemorate the development of the bicycle.
C. They are nice places to visit on bicycle tours.
D. They help to make New Jersey a wealthy state.
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单项选择题

血友病B的治疗可输注（）

A.5天以上的血浆

B.凝血酶原复合物

C.冷沉淀物

D.1-脱氧-8-精氨酸加压素

E.纤维蛋白原
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