下述描述定义，属二型观测线是（）
A．基牙向缺隙相反方向倾斜时所画出的观测线
B．基牙向缺隙方向倾斜时所画出的观测线
C．基牙向颊侧或舌侧倾斜时所画出的观测线，基牙的近、远缺隙侧均有明显倒凹
D．基牙向颊侧或舌侧倾斜时所画出的，但基牙的近、远缺隙侧均没有明显倒凹
E．基牙向缺隙方向或者反缺隙方向极度倾斜时形成的，观测线一端接近抬方，另一端接近基牙颈部
参考答案：B
解析：
二型观测线：为基牙向缺隙方向倾斜时所画出的观测线。此线在近缺隙侧距
面近，而远缺隙侧距面远，说明近缺隙侧的倒凹大，远缺隙侧的倒凹小。
You may have known several kinds of police --- traffic police, fire police and street police. But have you ever heard of energy-saving(节能) policeman? A group of 22 energy-saving policemen went to work last week in Beijing. They go around the city to see the use of energy in hotels, office buildings, shopping centers and other public places. One of their aims is to make sure that these places have set their air conditioning(空调) no cooler than 26℃. They also set up a special phone line so that people can tell them which buildings fail to follow the rule. “If everyone sets their air conditioning at 26℃, Beijing will save 400 million kilowatthour of electricity in one summer. That’s one-third of all the usages of the city in the season,” said a TV advertisement. Other Chinese cities, like Wuhan in Hubei Province and Yangzhou in Jiansu Province, are going to follow Beijing’s steps in setting up a similar police team. As one of the fastest developing countries, China is using a lot of energy. This has a great effect on the country’s environment and limited(有限的) energy. From 1986 to 2005, the country experienced 20 warm winters continuously(连续). Numbers show that Chinese cities have to spend billions of yuan solving environmental problems every year. At the beginning of this month, China made its first action plan to fight pollution. It aims to reduce energy usage by 20% and increase renewable(可更新的) energy up to 10% from 7% by 2010. To introduce the public to a green life, last week Beijing held a show on energy-saving technology and productions. Environment-friendly machines, such as a vending machine that helps collect used bottles, have attracted lots of attention. “We want to tell people that there are certain ways to protect the environment. Each of us can find effective ways to do it on our daily lives,” said Liu Qianguang, an environmental engineer in Beijing. 小题1:The job of the energy-saving policemen is ______.
|