题干

根据你的生活经验和所学的化学知识判断,下列做法正确的是(   )

A:在食品袋里充入氧气延长食品的保质期

B:钛合金与人体有很好的相容性,可用来制造人造骨

C:不慎打翻酒精灯而着火,用湿抹布扑灭主要是降低着火点

D:常用钢丝球擦洗铝壶可以使其光亮洁净和更耐用

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答案(点此获取答案解析)

B

同类题1

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    甲只见两个客人去车子前取出两个椰瓢来,一个捧出一大捧枣子来。七个人立在桶边,开了桶盖,轮替换着舀那酒吃,把枣子过口。无一时,一桶酒都吃尽了。七个客人道:“正不曾问得你多少价钱?”那汉道:“我一了不说价,五贯足钱一桶,十贯一担。”七个客人道:“五贯便依你五贯,只饶我们一瓢吃。”那汉道:“饶不得,做定的价钱!”一个客人把钱还他,一个客人便去揭开桶盖,兜了一瓢,拿上便吃。那汉去夺时,这客人手拿半瓢酒,望松林里便走。那汉赶将去。只见这边一个客人从松林里走将出来,手里拿一个瓢,便来桶里舀了一瓢酒。那汉看见,抢来劈手夺住,望桶里一倾,便盖了桶盖,将瓢望地下一丢,口里说道:“你这客人好不君子相!戴头识脸的,也这般罗唣!”

    乙我且问你:这七人端的是谁?不是别人,原来正是晁盖、吴用、公孙胜、刘唐、三阮这七个。却才那个挑酒的汉子便是白日鼠白胜。却怎地用药?原来挑上冈子时,两桶都是好酒。七个人先吃了一桶,刘唐揭起桶盖,又兜了半瓢吃,故意要他们看着,只是叫人死心塌地。次后,吴用去松林里取出药来,抖在瓢里,只做走来饶他酒吃,把瓢去兜时,药已搅在酒里,假意兜半瓢吃,那白胜劈手夺来,倾在桶里。这个便是计策。那计较都是吴用主张。这个唤做“智取生辰纲”。

同类题5

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    Public Speaking Training

    Get a coach

    ____ so get help. Since there are about a billion companies out there all ready to offer you public speaking training and courses, here are some things to look for when deciding the training that’s right for you.

    Focus on positives

    Any training you do to become more effective at public speaking should always focus on the positive aspects of what you already do well. Nothing can hurt confidence more than being told that you aren’t doing well.____ so good public speaking training should develop those instead of telling you what you shouldn’t do.

    ____

    If you find a public speaking course that looks as though it’s going to give you lots of dos and don’ts, walk away! Your brain is so full of what you're going to be talking about.____ As far as we’re concerned, there are basically no hard and fast rules about public speaking. Your audience can be your friends.

    You are a special person not a clone (克隆人)

    Most importantly, good public speaking training should treat you as a special one, with your own personal habits.____Your training course should help you bring out your personality, not try to turn you into someone you’re not.

A. You aren’t like anybody else

B. You already do lots of things well

C. Turn your back on too many rules

D. Check the rules about dos and don’ts

E. Whatever the presentation, public speaking is tough

F. The one thing you don’t want is for them to fall asleep

G. So trying to force a whole set of rules into it will just make things worse