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【单选题】
下列基团有助色功能的是( )。A.
—NO2
B.
—CHO
C.
—NH2
D.
—C=O
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【简答题】《魔笛》是奥地利作曲家( )的作品1971年首演于维也纳。
【单选题】下列哪一项不属于有机磷农药中毒的主要表现
A.
呼吸道分泌物增加，严重时发生肺水肿
B.
全身紧束感、恶心、呕吐、食欲不振
C.
头晕、头疼、言语不清及不同程度意识障碍
D.
症状消失后2～3周个别患者出现周围神经病
E.
肝功能严重受损及坏死性胰腺炎
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