方程|x|=cosx在（﹣∞，+∞）内[ ]
A． 没有根
B． 有且仅有一个根
C． 有且仅有两个根
D． 有无穷多个根
答案：C
—Could I borrow_____ money from you?
—Sorry, I don't have_____ on me. [ ]
A. some; some
B. any; any
C. some; any
D. any; some
钢材的屈强比越小会怎么样？
