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【单选题】
导致免疫失败的原因是多方面的,下列关于导致免疫失败的说法中错误的是 ( ) 。A.
疫苗稀释不当,没有按照规定使用指定的稀释液配制。
B.
使用活疫苗前后7天内使用抗菌药物。
C.
饮水免疫前进行断水,因此造成饮水时间太长,导致疫苗效力下降。
D.
抗体水平过高
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【简答题】新建 excel 工作簿的快捷键是 ________
【单选题】---When did he meet his wife for the first time？ ---It was _________ he came back from Africa that year _________ he met his wife.
A.
when; then
B.
not until; that
C.
not; until
D.
only; when
【简答题】阅读理解 Einstein was born in 1879 in Germany. As a child he was slow to talk. But when he was 14 years old, he became clever. He taught himself maths from text books. He studied hard because he wanted to...
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