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【单选题】
属注册分类1和4的,临床试验最低病例数(试验组)要求,III期为A.
18~24例
B.
20~30例
C.
100例
D.
2000例
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A.
希腊的史诗奠定了良好的基础
B.
港口城市，贸易发达，富庶的城邦
C.
城邦制度巩固，从独裁到寡头到民主
D.
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A.
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A.
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B.
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A.
重结晶时对母液的浓度（固体溶质）没有严格要求
B.
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C.
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D.
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A.
溶解度必须很大
B.
溶剂必须是惰性的
C.
溶剂的沸点不能高于被重结晶物质的熔点
D.
溶剂必须容易和重结晶物质分离
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