题目内容

青霉素过敏致血清病型反应,一般出现在用药后()。

A. 2~3天
B. 3~5天
C. 5~6天
D. 7~12天
E. 12~15天

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As the plunger moves upwards in the barrel, injection will commence once the plunger has () the spill ports and the pressure builds up.

A. opened up
B. closed off
C. lined up
D. taken off

加压钻进

为什么说LED是一种冷光源?

颅缝分离骨折常见于()

A. 人字缝
B. 冠状缝
C. 矢状缝
D. 蝶颞缝
E. 颞颧缝

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