人类血液中,免疫球蛋白占血浆蛋白总量的()
A.5%
B.10%
C.15%
D.20%
E.30%
参考答案:D
一般来说,吸收过程采用填料塔较之精馏过程具有更为有利的条件。()
The Chinese teacher asked her to _______ unnecessary words and sentences.
A.bring out
B.let out
C.leave out
D.make out