某同学做“观察水的沸腾”的实验: (1)它的实验装置和读温度值的方法如图所示,其

题型:问答题

问题:

某同学做“观察水的沸腾”的实验:

(1)它的实验装置和读温度值的方法如图所示,其中两处错误分别是:______.

(2)从开始加热到水沸腾后耗去一部分水,图中能描述这一过程中温度随时间变化的图象是______.

考点:沸腾及沸腾的特点
题型:问答题

阅读理解

     Come and look at the photo. It’s an American family. The woman in the middle is Beth White. She is

our teacher. The old woman on her right is her mother. She is Mrs. White. The man on her left is her

father, Mr White. He is an artist. The other young woman is Doris White. She is her sister. Doris White

has two children. They are students. Leo Bush is her son and May Bush is her daughter. May sits

between her grandfather and her father.

     "What are they doing?"

     "The family are having a big dinner on Thanksgiving Day(感恩节)."

1. This is          family photo.

A. an American  

B. an English    

C. a Chinese

2. There are          in Beth White’s family.

A. six people    

B. seven people  

C. five people

3. They are having           .

A. sports  

B. a family meeting  

C. a big dinner on Thanksgiving Day

4. Beth’s family name is           .

A. Smith  

B. White  

C. Bush

5. Leo and May’s father is _________.

A. Mr White    

B. Mr Smith  

C. Mr Bush

题型:问答题

_____ our club, please! [ ]

A. Join        

B. Join in        

C. Come        

D. Go

题型:问答题
如图所示,在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场,一个不计重力的带电粒子从坐标原点O处以速度v进入磁场,粒子进人磁场时的速度方向垂直于磁场且与x轴正方向成120°角,若粒子穿过y轴正半轴后在磁场中到x轴的最大距离为a,则该粒子的比荷和所带电荷的正负是(  )

A.,正电荷

B.,正电荷

C.,负电荷

D.,负电荷

题型:问答题

怎样做到坚持严明纪律和严惩腐败同向发力?

题型:问答题

装置全面停电时,以下处理错误的是()。

A、保护好操作人员

B、保护好压缩机、炉子等关键设备

C、保护好催化剂、吸附剂等贵重化工原材料

D、保护好各塔、罐液面不要太高

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