Which of the following is true?
A.An unconscious person knows he must die.
B.Brain death isn't a real death.
C.An unconscious person cannot realize he must die.
D.Brain death is a real death.
第5题
旋风分离器的分割粒径d50是()
A.临界粒径dc的2倍
B.临界粒径dc的2倍
C.粒级效率ηpi=0.5的颗粒直径
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