两种溶剂混合，形成比单一溶剂更易溶解药物的混合溶剂，称为潜溶剂。
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苯甲酸.对羟基苯甲酸酯类是优良防腐剂，可用于含有吐温的药液中。
A. 对
B. 错
____office is much smaller than ____.
A. Ours ; yours
B. Our ; yours
C. Theirs ; our
D. Mine; your
A friend of ____ came to see ____ yesterday.
A. his ; his
B. he ; him
C. his ; him
D. his;he
Who teaches ___ French?
A. we
B. our
C. us
D. his
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