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【简答题】
盐析法可使蛋白质表面电荷被中和及()被破坏,导致蛋白质在水溶液中的稳定性因素被去除而沉淀。
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举一反三
【多选题】What were the examples of China's efforts in solving environmental problems?
A.
Coal stored through Returning farmland to forest
B.
Value of China's energy saving and environmental industries
C.
Clean drinking water for rural people
D.
Space exploration
【简答题】What other things were invented in ancient China ______ the compass? 除了指南针，古代中国还发明了什么?
【单选题】In old China, young children were expected to obey their parents and never ()what their parents say.
A.
agree
B.
contradict
C.
apply
D.
character
【简答题】设s=′′中华人民共和国′′,如从中取出"共和国"3个字的表达式是 。
【单选题】设s="中华人民共和国",如从中取出"共和国"3个字的函数是________。
A.
SUBSTR(s,5,3)
B.
SUBSTR(s,9,6)
C.
SUBSTR(s,9,3)
D.
SUBSTR(s,5,6)
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