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单项选择题

抗心律失常的离子阻断剂不包括
A、钾离子阻断剂
B、钙离子阻断剂
C、镁离子阻断剂
D、钾离子阻断剂

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不定项选择
任意有限个开集的交集是开集.
A．错误
B．正确
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?Write 40—50 words.
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