简述生态因子分为哪五类
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5千克盐溶解在100千克水中，盐水的含盐率是5%．______．（判断对错）
商品肉猪出栏体重一般为（）㎏比较适宜。
A、70—80
B、80—90
C、90—100
D、100—110
Google, the Internet search and mapping company, has developed a car that can steer without a driver.
Sometimes the reality is stranger than science fiction: Google is road-testing cars that steer, stop and start without a human driver. The goal is to “help prevent traffic accidents, free up people’s time and reduce carbon emissions.” says Sebastian Thrun, who is the project leader for the driverless car, or Carbot.
By developing the car and the software that drives it, Google wants to change how people get from place to p1ace. Eric Schmidt, one of the company’s top officials, said, “Your car should drive itself. It just makes sense.”
So far, the driverless autos have gone about 140,000 miles on California roads without people taking over the driving. Many of the roads are very busy or full of curves that challenge human drivers. The autos’ software makes it possible to know speed limits, traffic patterns and road maps. The vehicles use radar, lasers and video cameras to find other cars and avoid people crossing streets.
There has only been one accident during the testing. And in that case, the Carbot was hit from behind by a human driver when Goog1e’s car was stopped at a red light. Engineers say the driverless cars are safer than autos with people behind the wheel because the computers react much more quickly than humans.
The Carbot is still in very early testing stages. Experts agree that it will be years before you will be able to buy one. But it is likely that one day you will be sitting in the driver’s seat of a driverless car. When the auto was first invented it was called a “horseless carriage”. Now it seems that it is time for the “driverless carriage” to be part of our 1ives.
小题1:What’s the main idea of the passage?
A．An auto revolution is on its way.
B．Google has developed a driverless car.
C．The Carbot has passed its early testing stages.
D．Science fiction has turned into reality.小题2:The driverless car is safer than an auto with people because _______.
A．it uses radar, lasers and video cameras
B．it knows speed limits, traffic patterns and road maps
C．the computer has a better sense of direction than drivers
D．the software responds to emergencies faster than a human driver小题3:The advantage of the Carbot is that _______.
A．it can drive all by itself
B．it can avoid any traffic accident
C．it doesn’t pollute the environment
D．it is the most fashionable car nowadays小题4:70. The author’s attitude towards the Carbot is _______.
A．unfriendly
B．desperate
C．critical
D．optimistic
MHC-Ⅱ类分子的抗原肽结合部位由（）
A.α1和α2结构域共同构成
B.α2和β1结构域共同构成
C.α1和β1结构域共同构成
D.α2和β2m结构域共同构成
E.β1和β2结构域共同构成
借款需求分析对银行的意义在于( )。
A．帮助银行有效地评估风险
B．帮助银行确定合理的贷款结构与贷款利率
C．为公司提供融资方面的合理建议
D．确定贷款总供给量
E．帮助银行增加盈利