题目内容

表面活性剂的增溶作用,是由于形成了

A. 络合物
B. 胶束
C. 包合物
D. 复盐

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I won’t call you, ________ something unexpected happens.

A. unless
B. whether
C. because
D. while

_______ he had not hurt his leg, John would have won the race.

A. If
B. Since
C. Though
D. When

Small sailboats can easily turn over in the water ______ they are not managed carefully.

A. though
B. before
C. until
D. if

The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.

A. after
B. before
C. since
D. when

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