搜题请搜索小程序“爱下问搜题”
问题 选择题

在“测量小灯泡的电功率”的实验中，下列说法正确的有          [ ]

A.在连线过程中.滑动变阻器应处于阻值最大处，开关断开

B. 电流表选0~0.6A和0~3A量程的测量效果是一样的

C. 实验中选择滑动变阻器和电阻箱是一样的，因为它们都能改变电路的阻值

D. 在选择电源时，电源电压越小越好

答案

答案：A

阅读理解

Dear Tom,

How are you? I'm at a new school this term. And I'm writing to tell you about my school. My new school is big and nice. There are one thousand and four hundred students and one hundred and forty teachers at my school. I like the teachers. They are very kind to me. My classmates are very friendly too. They teach me Chinese and l teach them English There are trees, flowers and green grass at my school. They are very beautiful. Behind my school there is a small river. The water in it is quite clean. We can swim in it. We have no classes on Saturdays or Sundays. Sometimes I play football or basketball with my classmates. Sometimes I stay at home and watch TV. Sometimes I go shopping with my father and mother. We all like China.

Please write to me soon!

Yours,

Jack

小题1:Jack is at a/an _______school.

A．English

B．Chinese

C．small

D．Japanese小题2:There are_______ students and _______ teachers at Jack's school.

A．1,400; 104

B．1,040; 104

C．1,400; 140

D．1,040; 140小题3:Jack's teachers _______.

A．teach him English very well

B．only teach him Chinese and English

C．don't like him at all

D．are quite good to him小题4:Jack _______his new classmates.

A．doesn't get on well with

B．doesn't like

C．makes good friends with

D．is going to learn English from小题5:Which is TRUE?

A．Jack goes to school every day.

B．Jack doesn't have classes every day.

C．Jack has no classes only on Saturdays.

D．Jack has no classes only on Sundays.
查看答案
单项选择题

甲型肝炎病毒具有哪项特点

A．是脱氧核糖核酸(DNA)病毒
B．黑猩猩和绒猴易感，但不能传代
C．甲型肝炎病毒感染后易成慢性携带者
D．在细胞培养中HAV引起细胞病变
E．只有一个血清型和一个抗原抗体系统
查看答案