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【单选题】
预测有机弱碱(pK a =4) .选用下列哪种色谱方法最为合适 A.反相键合相色谱法A.
离子抑制色谱法
B.
离子对色谱法 D.离子色谱法
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知识点：
皮皮学刷刷变学霸
举一反三
【多选题】在进行作用组合时需要解决的问题包括（ ）。
A.
设计中要考虑哪些荷载组合在一起
B.
对于具体的某个作用，应该选择哪个代表值参与组合
C.
对应的组合系数是多少
D.
有利组合和不利组合同时计算
【单选题】(共用题干16、17)男性,19岁,溺水被救出水后,神志不清,呼吸停止,口唇发绀,救护人员现场进行心肺复苏。 口对口人工呼吸的先决条件是( )
A.
气道开放而通畅
B.
病人置于仰卧位
C.
每次吹入800ml气体
D.
听诊器听诊发现呼吸停止
E.
征得家属同意
【单选题】He pretended everything the teacher said, but in fact he didn ’ t.
A.
to understand
B.
understanding
C.
understood
D.
understand
【单选题】_ on his novel, he didn ’ t notice the teacher coming.
A.
Fixed
B.
Fixing
C.
Fix
D.
To fix
【单选题】The pupil was so _____ that he didn ’ t hear what the teacher said.
A.
disappointed
B.
exhausted
C.
confused
D.
absent-minded
【简答题】Fill in the blanks with words that are often confused. 1. primitive, primary A. _________man made himself tools from sharp stones and animal bones. B. People had no letters at the____________ stage of...
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