问题 填空题

贾铭同学打算利用电能表来测量电视机实际消耗的电功率.他断开电能表连接的所有其他用电器,只把电视机打开,在t秒内测得电能表的盘转数为N.如果电能表铭牌上标明每千瓦时的盘转数为n,电视机的电功率为______瓦.

答案

电视机消耗的电能为:W=

Nr
nr/kW?h
=
N
n
kW?h=
N
n
×3.6×106J,

电视机的功率:P=

W
t
=
N
nt
×3.6×106W,

故答案为:

N
nt
×3.6×106W.

阅读理解

Section B

Directions: Read the following four passages.  Each passage is followed by several questions or unfinished statements.  For each of them there are four choices marked A, B, C and D.  Choose the one that fits best according to the information given in the passage you have just read.

(A)

E-BAE STORES

A one-stop shopping place for ALL

We sell used clothes, games, books, CDs and DVDs.  This is also a place for buyers to buy your second-hand goods.  E-BAE is the best platform to market or purchase your dream items.  It is noise-free, complaint-free and no shopping crowd.  Goods are going at the lowest prices you can find in the town.

I am selling a computer.  It is a well-maintained second hand computer with a LCD monitor and a rechargeable battery.  It is at an affordable price.  E-mail Fred at frogprince@hotmail.com

Selling: Hiking shoes.  Worn only once.  In tip-top condition.  Dark brown leather material with black laces.  Branded. 

Original Price: $198

Sale Price: $120

Please drop an e-mail to Daniel at damiao@gmail.com

For sale: branded PEAR iPod with a thin black and silver body.  1 year old.

Storage size: 2GB

Original Price: $159

Sale Price: $100

Interested?  Please contact Jace at moveit@pacific.net.sg

Looking for the right bag for the right occasion?  We have a collection of big-name bags to suit your needs.  All on rent or going at amazingly low prices.  Drop an e-mail message to Chanel at quirkyfinds@yahoo.com or visit chanel.blogspot.com to answer your needs.

65. According to the advertisement, which of the following is the benefit of E-BAE Shop?

A. Crowding with customers. B. Paying original prices.

C. Shopping with ease and comfort.        D. Shopping with free shipping.

66. Which of the following items is not sold on the webpage?

A. Second-hand shoes.    B. Designer bags.

C. Electronic goods.                   D. Computer batteries.

67. If Anne needs a bag for a dinner party, which email address can she use to contact the person in charge?

A. frogprince@hotmail.com    B. damiao@gmail.com

C. moveit@pacific.net.sg        D. quirkyfinds@yahoo.com

问答题