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举一反三
【单选题】Obtaining Drinking Water from Air Humidity Not a plant to be seen，the desert ground is too dry．But the air contains water，and research scientists have found a (51) of obtaining drinking water from a...
A.
who
B.
where
C.
when
D.
which
【多选题】冷却的目的是( )
A.
抑制乳中微生物的生长繁殖，保持乳的新鲜度。
B.
提高原料乳的抗菌力。
C.
除去机械杂质，使乳达到工业加工原料的要求。
D.
除去乳腺组织和白细胞。