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【单选题】
酶的分离提纯中不正确的方法是:A.
全部操作需在低温下进行,一般在0-5℃之间
B.
酶的提取物可长期保存于一般的4℃冰箱
C.
提纯时间尽可能短
D.
可采用一系列提纯蛋白质的方法如盐析、等电点沉淀等方法
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举一反三
【单选题】When the speaker finished his speech, he was affected to see his speech ________ with cheers and applauses from the audience. [ ]
A.
was met
B.
was welcome
C.
was popular
D.
was greeted
【简答题】勤勉の意味は
【单选题】The mayor was asked to ______ his speech in order to allow his audience to raise questions.
A.
constrain
B.
conduct
C.
condense
D.
converge
【单选题】— Didn't bob get ready for his English speech? — No, he didn't. During his speech, he was very _____. [ ]
A.
excited
B.
womed
C.
nervous
D.
confident
【简答题】红十字会统计本月应付工资明细款,期中管理人员工资8080元,从事服务活动人员工资5650元。 借:______ 8080 ______ 5650 贷:应付工资 13730
【简答题】The mayor was asked to ________ his speech in order to allow his audience to raise questions. A) constrain B) conduct C) condense D) converge
【简答题】简述烟熏痕迹的提取方法。
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