题干

用NA表示阿伏加德罗常数,下列说法中正确的是
①18gD2O含有的电子数为10NA ②同温、同压下,相同体积的氟气和氩气所含的原子数相等 ③标准状况下,11.2L以任意比例混合的氮气和氧气所含的原子数为NA ④在标准状况下,22.4LSO3的物质的量为1mol ⑤4℃时5.4mL的水所含的原子总数为0.9NA ⑥0.1molOH含0.1NA个电子⑦1mol Na2O2与水完全反应时转移电子数为2NA

A:③⑤⑥⑦

B:③⑤

C:①②④⑦

D:③④⑤⑥

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答案(点此获取答案解析)

B

同类题5

任务型阅读,请阅读下面这篇文章,根据所提供的信息,完成下面的信息卡。

    We often dine out with others, but do you know some basic etiquette (礼节)? If you behave well at the table, it will make your partners happy. But if you don't know how to behave yourself, you will feel embarrassed. Here are some tips for the table etiquette.

    When helping a woman pull her chair to the table, hold it and guide it. Don t shove(碰撞)it against the back of her legs.
     If you're seated at a table with eight or fewer guests, wait for everyone to be served and for the hostess(女主人) to begin eating before you dig in. At a long banquet table, it's OK to start when several people are seated and served.

    If you prefer not to have wine while dining out, don't turn your glass upside down, and don t make a big deal of saying you don't drink. Simply place your fingertips on the rim(边缘) of the glass and say" Not today, thanks."

    When you excuse yourself to go to the restroom, just say" Please excuse me."

    When out with friends or family—even at a fancy restaurant –it's OK to ask for your leftovers(吃剩的饭菜) to be wrapped. But don't do it at a business lunch or dinner.

Information Card

The feeling you may get if you don't behave well at the table

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The number of the guests when waiting for everyone to be served

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The reason why you place your fingertips on the rim of the glass

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The time that don't ask for your leftovers to be wrapped

____

The number of suggestions for the table etiquette

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