题目内容

以下关于硝基化合物的说法正确的是

A. 硝基化合物一般为淡黄色的液体或固体，有些芳香族硝基化合物具苦杏仁味，一般难溶于水，易溶于有机溶剂。
B. 多硝基化合物在受热时易发生爆炸，可用作制烈性炸药。
C. 大多数硝基化合物具有毒性，易引起肝肾、中枢神经和血液中毒，故贮存和使用时应特别注意。
D. 以上都正确

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更多问题

硝基化合不具有哪些化学性质

A. 酸性
B. 还原反应
C. 取代反应
D. 氧化反应

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听力作业2In this section, you will hear a long conversations. At the end of the conversation, you‘ll hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).第12题 What’s the decision of the woman’s boss?

A. He decided to hand out the advertisement on the street.
B. He decided to advertise his business online.
C. He decided to put the advertisement on newspapers.
D. He decided to put the advertisement on the signpost.

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第13题 Why does the woman's boss decide to advertise his business online?

A. Because newspaper advertisements are too expensive.
Because he likes searching online.
C. Because he lacks money.
D. Not mentioned.

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第14题 What does the sentence “he will get more bang for his buck” mean?

A. Hasty climbers have sudden falls.
B. He will get more money from the bank.
C. He never spends money within his budget.
D. He will get more value for the money he puts into something.

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