影响光度分析的因素有哪些?
参考答案:
(1)显色剂选择是否恰当;(2) 显色反应条件即试剂的浓度、显色时间是否适宜等对光度分析的准确性都有着重要的影响。
—How about going hiking this weekend?
—Sorry. I prefer ________ rather than ___________ .
A.to stay at home; go out
B.to go out; stay at home
C.staying at home; go out
D.going out; stay at home
肠外营养(PN)