在冷凝温度不变时,蒸发温度升高,制冷量应()。
A.减少
B.增加
C.不变
D.说不清
参考答案:B
I felt a little tired _____ the end of the day. [ ]
A. to
B. in
C. at
D. on
食品哈喇味是怎样形成的?