如图所示,闭合电键S,灯L1、L2正常发光,由于电路出现故障,突然发现灯L1变暗

题型:选择题

问题:

如图所示,闭合电键S,灯L1、L2正常发光,由于电路出现故障,突然发现灯L1变暗,电流表读数变小,则故障可能是

A.R1断路

B.R2断路

C.R3短路

D.R4短路

考点:串联电路的电流、电压和电阻并联电路的电流、电压和电阻
题型:选择题

阅读理解。

     Frank is my good friend. We are in the same class. He is fourteen, one year older than I. His parents are

both teachers in No. 7 Middle School. Frank is a good student. He studies hard. His English and math are very

good. He often helps other students with their English and math. Our teachers like him very much.

     We go to school together by bike in the morning. We have lunch at school. After school in the afternoon,

we often play sports. We play soccer and baseball. In the evening, he does his homework at home. Sometimes

he watches soccer games on TV. On Sundays, he goes out with his parents in his father's car. They play in

the park and do sports there. Sometimes my father takes me there, too. We play sports together. We have a

good time.

1. Who is Frank? He is a __________.

A. teacher

B. soccer play

C. student

D. driver

2. I am __________ years old this year.

A. fourteen

B. thirteen

C. fifteen

D. twelve

3. Frank is good at __________.

A. Math and Chinese

B. English and Chinese

C. math and English

D. English and Chinese

4. Frank __________ at school.

A. has breakfast

B. has supper

C. has lunch

D. watches TV

5. When does Frank do his homework?

A. In the evening

B. In the morning

C. In the afternoon

D. At noon

题型:选择题

已知关于x的方程x2+mx-6=0的一个根为2,则m=______.

题型:选择题

小麦的散落性与哪些因素有关?

题型:选择题

补贴的方式

题型:选择题

压耳主要表现是恶心、呕吐。

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