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【判断题】
当胶体表面的正电荷和负电荷相等,表面不带电荷时,体系的 pH 值叫电荷零点,简写为 PCZA.
正确
B.
错误
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【单选题】Pity those who aspire to put the initials PhD after their names. After 16 years of closely supervised education, prospective doctors of philosophy are left more or less alone to write the equivalent o...
A.
most of them died of some sickness
B.
their holidays and evenings have been ruined by their jobs
C.
most of them are completely tired of the narrowly defined subject
D.
most of their grants run out
【单选题】She'll be back to her hometown_____time. [ ]
A.
after a few years'
B.
in a few years'
C.
after a few years
D.
in a few year's
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