【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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【单选题】
下列哪项描述不正确（ ）
①
氨基甙类抗生素对Ｇ－杆菌有较强的抗菌作用
②
氨基甙类在碱性环境中抗菌作用较强
③
氨基甙类对静止期细菌有杀灭作用
④
氨基甙类抗菌作用主要与其增加胞膜通透性有关
⑤
氨基甙类口服难吸收，可用于胃肠道消毒