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已知烟碱(尼古丁)的化学式为C10H13N2,其相对分子质量为___;各元素的...
(1)烟碱(尼古丁C10H13N2)的相对分子质量=12×10+1×13+14×2=161(2)烟碱(尼古丁C10H13N2)的各元素的质量比=12×10::1×13:14×2=120:13:28故答案为:(1)161;(2)120:13:28 ...
2024-04-20 11:11:28 -
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2024-04-20 11:11:28 -
孩子可以用大人的医保卡吗
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小孩可以用大人的医保卡吗
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2024-04-20 11:11:28 -
小孩可以用大人的医保卡看病吗
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2024-04-20 11:11:28