若i1＝2i2，n1=n2/2，则当户相同时，（）。
A. (F/P，i1，n1)＜(F/P，i2，n2)
B. (F/P，i1，n1)=(F/P，i2，n2)
C. (F/P，i1，n1)＞(F/p，i2，n2)
D. 不能确定(F/P，i1，n1)与(F/P，i2，n2)的大小
You will be late ______ you leave immediately.
A. unless
B. until
C. if
D. or
包装材料应允许物品内部空气的排出和蒸汽的透入不应用
A. 市售铝饭盒与搪瓷盒
B. 带通气孔的器具
C. 全棉布
D. 一次性无纺布
E. 一次性复合材料(如纸塑包装)
Many players who had been highly thought of have ______ from the tennis scene.
A. disposed
B. disappeared
C. discouraged
D. discarded
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