下列化学实验操作正确的是

题型:选择题

问题:

下列化学实验操作正确的是

考点:测容器—量筒称量器—天平加热器皿—酒精灯常见仪器和装置的用途
题型:选择题

劲度系数为k的轻弹簧的一端固定在墙上,另一端和质量为M的容器放在光滑水平面上。开始时将弹簧压缩Lo,然后撤去外力,使容器绕O往复运动,在O的上方有一滴管,容器每通过O点一次,就有质量为m的一个液滴落入容器,则(   )

A.弹簧、容器(包括液滴)系统机械能守恒

B.液滴落入容器的短暂时间内系统水平方向动量守恒

C.容器振动的振幅逐渐减小

D.容器振动的周期逐渐增加

题型:选择题

阅读理解。

     Giving someone good news is easy, but what about bad news? Are there any good ways to give bad

news without making people too upset? The following steps might help:

     Say something positive. Try to start or end the conversation with some good news, so that it's not all bad.

For example, "You did very well in the interview, but unfortunately we've given the job to somebody else."

     Prepare your listener for the news. Use phrases to introduce what you're going to say, like "Unfortunately,....", "I'm really sorry, but..." or "I'm afraid I've got some bad news." This gives the listener time to prepare

for what you' re going to say.

     Try to give a reason. People like to know why things go wrong. Try to explain the decision. If someone

doesn' t get the job, can you explain why? If you have to cancel an appointment, try to give a reason.

     Use a soft tone of voice. If you're giving someone bad news, try to use a soft, calm voice to make your

sound kind. Say things to show you understand, like "I'm really sorry." or "I know this must be disappointing."

1. Which step isn't mentioned in the passage?

A. Talk about problems.

B. Try to give a reason.

C. Say something positive.

D. Prepare your listener for the news.

2. What does the underlined word "tone" mean in Chinese?

A. 词语

B. 语气

C. 眼神

D. 手势

3. Linda failed the test. She could tell her mum the news beginning with "_______".

A. You lucky thing!

B. You'll never guess what.

C. Bad news, I'm afraid.

D. That' s really wonderful.

4. Which of the following is NOT true according to the passage?

A. "Unfortunately" can be used to tell the bad news.

B. You can start the conversation with some good news.

C. Tone of voice is important when giving the bad news.

D. Nobody likes to know the reason why things go wrong.

5. The best title for the passage is "_______".

A. Bad news can be good news

B. Good ways to give bad news

C. It's easy to give bad news

D. Giving bad news without any trouble

题型:选择题

临床医学研究中的知情同意原则()

A.欺骗、威胁、利诱进行医学临床实验违反了道德和法律

B.负担和受益要公正分配

C.受试者与研究者之间应保密

D.死亡家属有权获得赔偿

E.需获得伦理专家委员会(或主管部门)的批准

题型:选择题

造成公民身体伤害的,税务赔偿义务机关应当支付医疗费,以及赔偿因误工减少的收入。减少的收入每日赔偿金最高限额为( )。

A.国家上年度职工日平均工资

B.国家上年度职工平均工资的5倍

C.国家上年度职工平均工资的10倍

D.国家上年度职工平均工资的20倍

题型:选择题

简述维果斯基的心理发展观。

更多题库