【单选题】【消耗次数：1】
龈沟液的特征包括（）
①
其成分与血清相似
②
具有清除异物，增进上皮与牙贴附的作用
③
是微生物的培养基
④
利于牙石和菌斑的形成
⑤
以上全是
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相关题目
【简答题】
增菌培养基
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透析用水染菌量监测需要用到的培养基是
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马铃薯蔗糖培养基
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溴甲酚紫葡萄糖蛋白胨水培养基
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无菌营养琼脂培养基
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营养肉汤或胰蛋白胨大豆肉汤培养基
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无菌R2A培养基
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