两个定值电阻,甲标有"16Ω,1.5A”乙标有"22Ω,0.5A”.现把它们串联

题型:选择题

问题:

两个定值电阻,甲标有"16Ω,1.5A”乙标有"22Ω,0.5A”.现把它们串联起来,则该串联电路两端允许加的最高电压是:[ ]

A .57 V

B.41 V

C.35 V

D.19 V

考点:欧姆定律及其应用
题型:选择题

阅读理解

       You may not have heard the words "freshman fifteen" before, but they are very important for students who are entering university. A freshman is a first-year college student. "Fifteen" refers to fifteen pounds-the fifteen pounds added to a student's weight in his or her first year. There are a number of reasons why

first-year university students gain (增力n) weight; but it's encouraging to know that freshmen don't have

to add these harmful fifteen pounds.

Mistakes choosing food

       University kitchens serve(供应)many kinds of food. Some students choose unhealthy food,because

now their parents are not nearby to help them choose. Some students visit the kitchen many times while

studying. Late at night, some students get harmful fast food such as fish and chips with Coke to drink.

Students also have less time for walking, running, and doing sports because of their schoolwork.

Eating right

       If you're careful, you don't have to add fifteen pounds. Here are some ideas:

       Think more about what you eat.

       Eat plenty of vegetables and healthy meats.

       Don't eat desserts full of sugar; have fruit after dinner.

       Try not to eat so much unhealthy food while you study.

       It's all right to have a little fast food sometimes-but not often.

       Write down the foods you eat.

       Walk, run, do sports-move and you will feel better!

       Remember that the "freshman fifteen" can happen to anyone. Talk to your friends about it. Together,

try to eat healthy food and not to eat unhealthy food. Walking, running, and playing sports is always more

fun with friends. Help each other and you can have a healthy and happy freshman year.

1. The "freshman fifteen" is______.

A. weight that high school students gain

B. weight that first-year university students can gain

C. fifteen pounds of food that first-year students eat

D. fifteen students who eat unhealthy food

2. The main idea of this reading is to ______.

A. get students ready to gain fifteen pounds

B. sell healthy food to new students

C. help new university students not to gain fifteen pounds

D. show the mistakes students make in studying

3. Which of these mistakes students make choosing food is not mentioned in the reading?

A. Choosing unhealthy food.

B. Visiting the kitchen while studying.

C. Getting fast food at night.

D. Eating too much chocolate.

4. Which of these ideas would the writer of the reading probably agree with?

A. You'd better not eat unhealthy food.

B. Not eating unhealthy foods is easier with friends' help.

C. Gaining fifteen pounds can help you study better.

D. Some students can eat anything they want.

题型:选择题

我国第一位“太空教师”王亚平通过物理实验,展示了飞船内部物体在失重(相当于物体不受重力)情况下的物理现象,王亚平利用小球做了两次实验,第一次实验时,将小球偏离竖直位置后放手,第二次实验时,将小球偏离竖直位置后,在放手时对小球施加一个垂直于悬线的力,下列四图表示小球在这两次实验中可能出现的运动情况,其中符合实际的是(  )

A.甲、丙

B.甲、丁

C.乙、丙

D.乙、丁

题型:选择题

下列雌激素的生理作用,哪一项是错误的

A.刺激乳腺导管和结缔组织增生

B.促进 * * 上皮细胞增生、角化

C.促进子宫内膜增生、腺体分泌

D.使输卵管平滑肌活动增强

E.促进肾小管对钠和水的重吸收

题型:选择题

甲公司以2000万元购入一项专利权,按照协议约定款项在5年内偿还,每年偿还 20%,如果甲公司在购入专利权时一次性支付价款,则需支付1600万元。甲公司为购买该项专利权另外支付相关交易费用100万元。在不考虑其他因素的情况下,甲公司为取得该项专利权所花费的成本为( )万元。

A.1600
B.1700
C.2000
D.2100

题型:选择题

Jim borrowed a Chinese book from his classmate. He () it for three days.

A.has borrowed

B.has lent

C.has kept

D.lend

更多题库