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【单选题】
复数z=a+bi(a,b∈R)中,虚部为 ( )A.
b
B.
bi
C.
-bi
D.
-b
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反馈参考答案：
举一反三
【多选题】如何做到每天一杯奶?
A.
早餐饮用一杯200~250ml牛奶
B.
早餐饮用一杯500ml以上牛奶
C.
午餐加一杯100~125ml酸奶
D.
儿童早餐可吃奶酪2~3片
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