设集合A={x|x≤46},a=35,则正确的是( ) A.a∈A B.a∉A C.{

题型:选择题

问题:

设集合A={x|x≤
46
}
a=3
5
,则正确的是(  )
A.a∈AB.a∉AC.{a}∈AD.以上都不对
考点:集合的含义及表示
题型:选择题

已知函数f(x)=ax3+3x2-6ax-11,g(x)=3x2+6x+12,和直线m:y=kx+9,又f′(-1)=0.

(1)求a的值;

(2)是否存在k的值,使直线m既是曲线y=f(x)的切线,又是曲线y=g(x)的切线?如果存在,求出k的值;如果不存在,请说明理由.

题型:选择题

我国证券账户种类的划分依据包括( )。

A.交易场所

B.账户用途

C.投资目的

D.标的性质

题型:选择题

在计算机网络中,TCP/IP是一组( )。

A.支持同类型的计算机(网络)互联的通信协议
B.支持异种类型的计算机(网络)互联的通信协议
C.局域网技术
D.广域网技术

题型:选择题

道床具有哪些功能?

题型:选择题

(三)

Mr. Peter Johnson, aged twenty-three, battled for half an hour to escape from his trapped car yesterday when it landed upside down in three feet of water. Mr. Johnson took the only escape route-through the boot.

Mr. Johnson’s car had finished up in a ditch at Romney Marsin, Kent after skidding on ice and hitting a bank. "Fortunately, the water began to come in only slowly," Mr. Johnson said. "I couldn’t force the doors because they were jammed against the walls of the ditch and dared not open the windows because I knew water would come flooding in. "

Mr. Johnson, a sweet salesman of Sitting Home, Kent, first tried to attract the attention of other motorists by sounding the horn and hammering on the roof and boot. Then he began his struggle to escape.

Later he said, "It was really a half penny that saved my life. It was the only coin I had in my pocket and I used it to unscrew the back seat to get into the boot. I hammered desperately with a hammer trying to make someone hear, but no help came. "

It took ten minutes to unscrew the seat, and a further five minutes to clear the sweet samples from the boot. Then Mr. Johnson found a wrench and began to work on the boot lock. Fifteen minutes passed by. "It was the only chance I had. Finally it gave, but as soon as I moved the boot lid, the water and mud poured in. I forced the lid down into the mud and scrambled clear as the car filled up. "

His hands and arms cut and bruised, Mr. Johnson got to Beckett Farm nearby, where he was looked after by the farmer’s wife, Mrs. Lucy Bates. Huddled in a blanket, he said, "That thirty minutes seemed like hours. " Only the tips of the car wheels were visible, police said last night. The vehicle had sunk into two feet of mud at the bottom of the ditch.

"Finally it gave" (Paragraph 5)means that ().

A.Luckily the door was torn away in the end

B.At last the wrench went broken

C.The 10ck came open after all his efforts

D.The chance was lost at the last minute

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