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【简答题】
薄层色谱鉴别中,采用阴性对照的目的是什么?
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举一反三
【单选题】In recent years his health has ___________.
A.
goes downhill
B.
went downhill
C.
gone downhill
D.
go downhill
【简答题】e____e______t______ally
【单选题】IQ test is origin ally used to______.
A.
find out the students who need extra help in learning
B.
assign young people to different majors
C.
select the acceptable recruits for army
D.
select the leaders for society
【简答题】ally
【单选题】The static ally determinate beam with centralhinge is shown in the figure. If the concentrated couple M is moved from the right side of the hinge C to the left side,.
A.
the Q diagram of the beam remains unchanged and the M diagram changes
B.
the M diagram of the beam remains unchanged and the Q diagram changes
C.
both the Q and M diagrams are changed
D.
both the Q and M diagrams are unchanged
【单选题】In the second stage of the evolution of mind,______.
A.
the response of the organism is determined by the intrinsic properties of the things in question
B.
the reactions of the organism are free from the intrinsic properties of things
C.
the organism distinguishes between things involved at a distance
D.
the organism can merely react to an intermediate stimulus
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