R22系统中存有空气,将使系统()。
A、冷凝压力降低
B、蒸发温度降低
C、冷凝压力升高
D、蒸发温度升高
参考答案:C
Every painting she ______ to her country, which was her will. [ ]
A. had been contributed
B. had to be contributed
C. had contribute
D. had was contributed
()建于法国东部的朗香教堂,是二次世界大战以后,()设计的一件最引人注意的作品。