外债的偿债率指标国际标准安全线为（）.A.1 B.20% C.25% D.50%_爱下问搜题

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问题单项选择题

外债的偿债率指标国际标准安全线为（）.

A.1

B.20%

C.25%

D.50%

答案

参考答案：B

选择题

Tom was about to close the window _____ his attention was caught by a bird. [ ]

A. when

B. if

C. and

D. till

填空题

表面活性剂在膜剂中起（）作用。