分离某些α接近1的物系时,可采用一些特殊的精馏方法,如(),()
参考答案:萃取精馏;恒沸精馏
The magician(魔术师)Liu Qian from Taiwan performed his tricks at the 2009 Spring Festival Gala(联欢会).
A.succeeded
B.successful
C.success
D.successfully
脊髓灰质炎病人自起病之日起应隔离至多少天()
A.10天
B.20天
C.30天
D.40天
E.50天