甲醇闪蒸操作要消耗一定能量，它只能产生压降，而不会产生温降。
参考答案：对
解析：甲醇闪蒸操作要消耗一定能量，它不但产生压降，而且会产生温降。
—I was caught in the heavy rain, so I couldn’t be back by 7 o’clock.
—__________! Janna was here to see you.
A．Good luck
B．What a pity
C．Never do it again
D．Well done
My father has been working on this farm for .
A．all this five years .
B．whole this five years .
C．these all five years
D．the whole five years.
