液液萃取法可选用的溶剂系统有

A．HO-EtO

B．HO-MeCO

C．HO-CHCl

D．EtOH-CHCl

E．HO-MeOH

[多选题]液液萃取法可选用的溶剂系统有A.HO-EtOB.HO-MeCOC.HO-CHClD.EtOH-CHClE.HO-MeOH

[多选题]液液萃取法可选用的溶剂系统有A.HO-EtOB.HO-MeCOC.HO-CHClD.EtOH-CHClE.HO-MeOH

[多选题] 液液萃取法可选用的溶剂系统有（）A . H2O-Et2OB . H2O-Me2COC . H2O-CHCl3D . EtOH-CHCl3E . H2O-MeOH

[单选题]H．o为A．两样本阳性率相等B．两总体阳性率相等C．样本所在的总体率与已知总体率相等D．样本率与总体率不等E．样本所在的总体率>0.1

[单选题]符号HO表示（）A . 虚无假设B . 研究假设C . 原假设D . 都不是

[单选题]It iS not possible to _________exactly how our actions will affect the future．A．expectB．forbidC．foreseeD．inspect

[试题](b) Prepare a reasoned explanation of how any capital gains tax arising in the UK on the sale of the paintingscan be minimised. (2 marks)

[单选题]OSI is a theoretical model that shows how any two different systems can communicate with each other. Router, as a networking device, operate at the ______ layer of the OSI model.A．transportB．applicationC．networkD．physical

[试题]AlthoughIliketheappearanceofthehouse,whatreallymademedecidetobuyitwasthebeautiful______________throughthewindow.A．)visionB)lookC．)pictureD)view

[单选题]The whole event probably lasted about hours from the moment Bieber came to the hotel to the arrival of some armed officers。A． 6 B. 8 C. 11 D. 14