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【简答题】
(1)配制100 mL 0.010 mol/L Na 2 S 2 O 3 溶液需要称量 Na 2 S 2 O 3 固体的质量为( )g (2) 配制100 mL 0.20 mol/L KI 溶液需要称量 KI 固体的质量为( )g (3) 配制50 mL 0.20 mol/L (NH 4 ) 2 SO 4 溶液需要称量 (NH 4 ) 2 SO 4 固体 的质量为 ( )g ( Na 2 S 2 O 3 分子量为: 248.19; KI 分子量为:166.00; (NH 4 ) 2 SO 4 分子量为: 132.14) (只需填写数字,注意有效数字运算规则)
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举一反三
【简答题】Didn ’ t she use to ____________(live) in Germany?
【简答题】将十六进制数D5.A转换为二进制数是( )。
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【单选题】What is the advantage for a company to use differentiation focus strategy?
A.
There is less competition and, therefore, greater pricing flexibility in the niche market.
B.
The company becomes more experienced and specialized at providing goods and services to a limited sector of consumers, and it can charge more for that expertise due to reduced competition.
C.
Both (A) and (B)
D.
Either (A) and (B)
【简答题】Some countries use ____________________ power to produce electricity.
【简答题】Use action verbs in the description of your jobs and ______.
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