【简答题】小亮,男性,16岁,再生障碍性贫血,病情危重,极度消瘦,不思饮食,需要插胃管进行补充营养。在给病人插胃管时,下列不妥的是
【多选题】酸碱滴定和配位滴定有什么不同点?()
A.
酸碱滴定以酸碱反应为基础,配位滴定以配位反应为基础
【单选题】Some morphemes have _______ as they are realized by more than one morph according to their position in word.
【单选题】RC串并联网络在f=f0=1/(2πRC)时,电路呈( )。
【单选题】稳定常数K不能表达配位滴定的完全程度。下列有关说法不正确的是()
A.
K 是游离金属离子 M 与游离 Y 型体所表达的常数
B.
配位滴定的完全性(或误差)要化学计量点时的 M’ 和 Y’
C.
如果没有副反应, K 可能表达滴定的完全程度
【单选题】Which statement below is correct about the form -er in the words listed here: teach er , bigg er , eras er , London er ?
A.
All these words have the same morpheme.
B.
Every word listed in this question has an allomorph of {-er}.
C.
Some different morphemes can be represented by the identical form.
D.
-er here is used to form new words, hence a derivational affix.
【单选题】改变水溶液的pH至酸性,再用有机溶剂萃取,可得( )