单项选择题
Thenitrogenatominthecompoundbelowhasapositivecharge:()
A.正确
B.错误
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单项选择题
carbonatomsinastraightchainaredrawninazigzagformat()
A.正确
B.错误
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neutralcarbonatomsalwayshaveatotaloffourbonds()
A.正确
B.错误
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