题目内容
(请给出正确答案)
[主观题]
Heat exchangersA.recover up to 90% of heat that would otherwise be lost.B.recover over 90%
Heat exchangers
A.recover up to 90% of heat that would otherwise be lost.
B.recover over 90% of heat that would otherwise be lost.
C.are difficult to use.
提问人:网友wl36978
发布时间:2022-01-06