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【简答题】
HIV对外界的抵抗力较弱表现在() A56℃30分即被杀灭 B15%以上酒精能杀灭病毒 C0.2%次氯酸钠能灭活HIV D对0.1%福尔马林紫外线和r射线不敏感
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举一反三
【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away