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【判断题】
十二烷基磺酸钠（SDS）与蛋白质结合后先负电荷A.
正确
B.
错误
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】(备注:由于系统不识别公式和图片,请用文字填“大等于”或“小等于”)
【单选题】The smile on the teacher's face shows that he is _____ with the work of the class. [ ]
A.
pleased
B.
sorry
C.
angry
D.
strict
【单选题】On the man’s face , there was a smile that seemed to suggest that he _______ in suggesting that the meeting ______ off .
A.
should succeed , was put
B.
succeeded , put
C.
should succeed, be put
D.
succeeded , be put
【单选题】有一个房间里,点燃了10支蜡烛。一阵风吹来,吹灭了3支。过了一会儿,又吹灭了3支。把窗户关起来以后,蜡烛就再也没有被吹灭了。 请问:最后还剩下几支蜡烛?
A.
4支
B.
6支
C.
3支
D.
0支
【简答题】按建筑的规模和数量可分为 和
【单选题】The sentence “ your smile might make somebody’s day” in para 6 implies that ______.
A.
you must smile to make somebody feel happy
B.
your smile may make someone have a good mood all the day
C.
your smile is unimportant for someone else
D.
you must smile all the day to stay in a good mood
【简答题】So, smile when there’s something to smile about.
【简答题】有一个房间里,点燃了 10支蜡烛。一阵风吹来,吹灭了3支。过了一会儿,又吹灭了3支。把窗户关起来以后,蜡烛就再也没有被吹灭了。 请问:最后还剩下几支蜡烛 ?
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