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【简答题】
中学化学中几种常见物质的转化关系如图19所示，且已知将F的饱和溶液滴入沸水中，煮沸可得到以H为分散质的红褐色胶体。 请回答下列问题： （1）红褐色胶体中H粒子的直径大小范围 。 （2）写出D、E的化学式：D 、E （3）①写出H 2 O 2 的电子式： ②写出E的酸性溶液与双氧水反应的离子方程式 。 （4）写出检验F中阳离子的实验操作、现象及有关反应的离子方程式。 实验操作 ； 现象 ，离子方程式 。 （5）在E溶液中加入与E等物质的量的Na 2 O 2 能恰好使E转化为H，写出该反应的化 学方程式 。
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【单选题】No.14
A.
She is over the speed limit.
B.
She is on the wrong way.
C.
She is making a phone call.
D.
She is smoking while driving.
【简答题】No.14
【单选题】No.14
A.
Review the detail of all her lessons.
B.
Compare notes with his classmates.
C.
Talk with her about his learning problems.
D.
Focus in the main points of her lectures.
【单选题】The main difference between cancelable insurance policies and non-cancelable policies is______.
A.
the cost
B.
limitations
C.
valid term
D.
policyholder's age
【单选题】What is the difference between command-and-control policies and market-based policies toward externalities?
A.
a. Command-and-control policies provide incentives for private decision makers to solve the problems on their own, whereas market-based policies regulate behavior directly.
B.
b. Command-and-control policies rely on taxes, whereas market-based policies rely on quotas.
C.
c. Command-and-control policies regulate behavior directly, whereas market-based policies provide incentives for private decision makers to change their behavior.
D.
d. Command-and-control policies are efficient, whereas market-based policies are inefficient.
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