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【单选题】
常用的室内照明电压220V是指交流电的（ ）A.
有效值
B.
瞬时值
C.
最大值
D.
平均值
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反馈参考答案：
举一反三
【多选题】关于沙门菌的抗原成分,下列哪种说法是对的
A.
O抗原是分群的依据，其刺激机体产生的抗体以IgM为主
B.
H抗原是分型的依据，其刺激机体产生的抗体以IgG为主
C.
Vi抗原位于菌体最表层
D.
Vi抗原存在时可阻止O抗原与相应抗体发生凝集
E.
M抗原可作为血清学分型依据之一，主要用于流行病学调查和追踪传染源
【单选题】Since World War II, there has been a clearly discernible trend, especially among the growing group of college students, toward early marriage. Many youths begin dating in the first stages of adolescen...
A.
can be clearly seen
B.
is the result of the Great Depression of the 30's
C.
can't be easily determined
D.
is an outgrowth of the moral looseness brought about by World War Ⅱ
【单选题】_________our hometown is only a small one, the number of foreigners living and working here is growing fast.
A.
Because
B.
Although
C.
Since
D.
If
【简答题】如果保证三个选项卡页中的图像显示是一致的?
【简答题】It can be inferred from the text that [A] private-equity pays more attention to fast growing industries. [B] newcomers deny the fact that technology is vital to media industry. [C] traditional media m...
【简答题】图像显示控制:如果保证三个选项卡页中的图像显示是一致的?
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