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【单选题】
病毒的灭活是指病毒在理化因素作用下失去:A.
抗原性
B.
传染性
C.
血凝特性
D.
诱生干扰素的能力
E.
细胞融合特性
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【单选题】On a clear，warm day，you notice the approach of a tall cumulus cloud.The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead ___...
A.
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B.
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C.
the wind speed will not change as it passes
D.
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