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【单选题】
下列句子中哪个是命题? ( )A.
你的离散数学考试通过了吗？
B.
请系好安全带！
C.
2是有理数
D.
本命题是假的
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A.
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B.
the； a
C.
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D.
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【简答题】已知下列命题 : “ 唯物主义者都不是有神论者。 ” 为真,请指出其同素材的另外三个性质命题的真假。
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