Imports from Asian countries are more competitive than U.S. home-made products because of lower wages in Asia and the exemption of duties for imported goods shipped to the United States.

冷凝温度升高时，冷凝压力也随之升高，（），制冷压缩机的的排气温度升高。

A.压力比增大

B.压力比减小

C.压力比不变

D.压力比成倍增大