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【单选题】
碘量法测定铜盐中铜的含量,利用的反应为:CuSO4+4I-=2CuI↓+I2 , I2+A.
a2S2O3→Na2S4O6+2NaI, 则CuSO4与Na2S2O3的基本单元的关系是()
B.
n(1/4 CuSO4）=n(Na2S2O3)
C.
n(1/2 CuSO4）=n(Na2S2O3)
D.
n(CuSO4）=n(Na2S2O3)
E.
n(1/2CuSO4）=n(1/2Na2S2O3)
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【简答题】专科医疗主要医学观是_______医学模式,全科医疗主要医学观是_________医学模式。
【简答题】CDR即为( )
【单选题】• Bell was nearly beaten to the patent office by (), who had independently developed a very similar telephone invention . A. Gray B. Morse C. Charles D. Reis
A.
Gray
B.
Morse
C.
Charles
D.
Reis
【判断题】To obtain a patent, a person must prove to the patent office that his or her invention is novel, useful, and not obvious in light of contemporary technology.
A.
正确
B.
错误
【单选题】He wrote his first science papers while ______ in the patent office in Bern, Switzerland.
A.
work
B.
to work
C.
working
D.
worked
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