12. Relative humidity is the amount of water vapor the air contains at a certain temperature _____ with the amount it could hold at that temperature.
(A) to compare
(B) compared
(C) comparing
(D) compares
为什么是B呢？
谁和谁的比值应该怎么说？
A compared B = A/B ？？？是吗？作者: nbnhjf 时间: 2004-12-2 20:08
a compared with B
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