It can be inferred from last two paragraphs that the author doubts about_______.
A.the rationality of capital allocation of government
B.the feasibility of invigorating labor market
C.the effectiveness of medicare programs
D.the possibility of reversing US downward trend
第5题
固相萃取有以下哪些优点:()
A取代传统的液--液萃取,不需要大量互不相溶的溶剂;
B处理过程中不会产生乳化现象;
C采用高效﹑高选择性的吸附剂,使萃取选择性高,重复性好;
D简化样品处理过程,减少费用。
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