污水回用的方式及途径有哪些?
参考答案:
(1)再生水:一级、二级
(2)回用途径:直接回用和间接回用。
At the meeting, the old man ______ some good advice about bringing down the market price of onion.
A.came about
B.came along
C.came up with
D.came out
苯巴比妥的酸度检查主要是控制副产物(),溶液的澄清度检查主要是控制()的量。