下列关于物质在氧气中燃烧现象的描述错误的是( ) A.镁带在氧气中燃烧,有白烟产

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问题:

下列关于物质在氧气中燃烧现象的描述错误的是(  )

A.镁带在氧气中燃烧,有白烟产生

B.细铁丝在氧气中燃烧,有黑色固体生成

C.蜡烛在氧气中燃烧,瓶壁有水雾产生

D.硫磺在氧气中燃烧,有大量白烟生成

考点:S,Fe,C,P等物质在氧气中的燃烧
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完成对话,每空一词。

John: Tim, glad to see you again. ______ (1) you enjoy your summer holiday?

Tim: Yes, how about you? Did you stay at home?

John: ______(2). I went to Emei Mountain in Sichuan and had a wonderful time there.

Tim: Really? So did I.

John: And I ______(3) to the top of the mountain.

Tim: So ______ (4)I.

John: And I stayed there for a night, and the next morning I saw the sunrise. It was great!

Tim: Oh, dear!______ (5)______ (6)I.

John: ______ (7) didn't I see you there?

Tim: I went in late July. And you?

John: Early August.What a ______ (8) we didn't go there at the same time!

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证券买卖双方在交易达成后,按证券交易所的规定,在成交日后的某个营业日进行交收的交收方式称为()

A.当日交收

B.次日交收

C.例行日交收

D.特约日交收

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餐饮业和集体用餐配送单位进行化学消毒时,所配好的消毒液应该定时更换,一般()小时更换一次。

A.1

B.2

C.4

D.6

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在气的生成和水液代谢方面关系密切的是

A.心与肾
B.心与肺
C.肺与脾
D.脾与肝
E.肺与肝

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不考虑别的因素,用大的波长会使雷达的作用距离()。方位分辨力()。

A、增大,增强

B、增大,降低

C、减小,增强

D、减小,降低

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