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【单选题】
最常用的培养基凝固剂是______,其浓度一般是固体______,半固体______。[湖南大学2013年研]A.
明胶，12～20g/L，4～5g/L
B.
明胶，3～5g/L，12～15g/L
C.
琼脂，15～20g/L，3～5g/L
D.
琼脂，12～20g/L，4～5g/L
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