下列说法错误的是() A.物体受到的合外力方向与速度方向相同时,物体做加速直线运

题型:选择题

问题:

下列说法错误的是(    )

A.物体受到的合外力方向与速度方向相同时,物体做加速直线运动

B.物体受到的合外力方向与速度方向成锐角时,物体做曲线运动

C 物体受到的合外力方向与速度方向成钝角时,物体做减速直线运动

D.物体受到的合外力方向与速度方向相反时,做减速直线运动

考点:斜抛运动
题型:选择题

如图所示,AB两点间的总电压为20V,五个电阻阻值均为4Ω,则电流表的示数为        A;电压表的示数为               V。

题型:选择题

阅读理解。

                                             Three Things to Do Before You Are 18

       Are you bored with your daily life? Here are some things you should try before you are 18, because

  after that it's too late.

       Learn to swim

       Seriously, this is so important that it can save your life. If you can't swim well, you won't be able to do

   water sports like waterskiing, surfing and diving. Even taking a boat trip will be dangerous for you. Make

   sure you do it.

       Try at least one kind of team sports

       Being a good team player is an important skill in life. You can't just think of yourself, but have to work

   well with other people. Other advantages of team sports like basketball, football and baseball are that

  they keep you fit and healthy, and they are also great fun. Teams usually have a good social life too -

  you'll go to lots of parties and make many friends.

       Collect something

       One of the best hobbies for under - 18s is collecting things. You could collect kinds of  stamps, or you

   could collect things that make you remember what you have done, like cinema tickets for films you have

  seen or emails from friends. The best way to collect is to have a special album to put your collection in

  and to write what each thing means to you. That way you won't forget.

1. The most important reason for learning to swim is that _____.    

A. it can save your life                            

B. it can make you healthy

C. you might easily do lots of things        

2. "A good social life" in the passage means _____.

A. you'll study in groups            

B. you'll go to parties and make many friends  

C. you'll take part in many matches                    

3. The writer tells us that one of the best hobbies is to _____. 

A. collect something                                

B. do some water sports

C. send emails to your friends       

4. What kind of collection is NOT mentioned (提及) in the passage?

A. stamps      

B. cinema tickets      

C. snowballs 

5. The passage is mainly about _____ before you are 18.

A. good habits to keep      

B. skills to have      

C. things to do

题型:选择题

石斛的功效有()

A、明目

B、化瘀止咳

C、润肺止咳

D、养胃生津

E、滋阴除热

题型:选择题

船舶通过卫生检疫检查的可()

A.在一小时后降下检疫信号

B.检疫官员离船后降下检疫信号

C.降下检疫信号

题型:选择题

某工业安装项目通过招标,建设单位与土建施工单位和设备安装单位分别签订了施工合同。设备安装时,监理工程师发现土建单位施工的某一设备基础预埋地脚螺栓位置与设备底座相应的尺寸不符,设备安装单位无法将设备安装就位,造成设备安装单位工期延误和费用损失。经调整,土建单位是按设计单位提供的设备基础图施工的,而建设单位采购的设备是设备的改型产品,基础尺寸与原设计图发生变化。对此,建设单位决定设计变更,按设备的实际尺寸重新预埋地脚螺栓,仍由原土建单位负责施工。土建单位与安装单位均依据合同条款的约定提出了索赔要求。

由于基础交付安装单位工期已拖10天,将影响安装单位的后续工程,因此安装公司增加施工力量和装备赶工,于合同要求日期完工,并向建设单位以据提出赶工索赔。

案例中提出的设计变更属于哪种类型?对工程建设进度、人工时耗费影响应由谁来承担?

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