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【单选题】
隐性感染的重要临床意义是A.
轻型病人增加
B.
显性感染减少
C.
带菌状态减少
D.
潜在性感染增加
E.
免疫人群扩大
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【单选题】Traveling abroad will cost much, but _____ it can improve your understanding to the world. A. however B. on one hand C. even if D. on the other hand
A.
however
B.
on one hand
C.
even if
D.
on the other hand
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