Moisture absorbed in the winding or condensed on the surface of electrical machinery nsulation

A . activate the driers B . change color C . secure the compressor D . add a predetermined amount of liquid drier

A . compressor B . condenser C . receiver D . evaporator

A . lantern rings B . bearings C . easing volutes D . wearing ring

A . flame temperature B . fuel oil C . air movement D . gas force

A . freeze on the expansion valve seat and reduce the flow of liquid refrigerant B . emulsify the oil in the condenser C . freeze in the king valve D . clog the oil tra

A . moisturizing B . dehumidification C . dampening D . humidificatio

A . pressure changes in the air mass B . movement of the air mass C . the heterogeneous nature of the air mass D . upper level atmospheric change

A . condenser B . vapor generator C . accumulator D . evaporator

A . ① only B . ② only C . Both ① and ② D . Neither ① nor ②

A . filers B . separators C . ducted traps D . dehumidifier

A . catenary B . step C . shock dip D . bight

A . short circuit B . speed up C . slow down D . hunting

A . 871 B . 872 C . 873 D . 874

A . filter B . filter drier C . heat exchanger D . air cooler

A . superheated B . saturated C . condensed D . convected

A . above B . below C . equal to D . uncertai

M: Perhaps I'd better read it through again. Q: What is the man most probably going to do？ (18) A．He is going to finish his term paper. B．He is going to hand in the paper. C．He is going to correct the errors in the paper. D．He is going to read it to the woman.

M: It's easier said than done. Q: What can we learn from the conversation？ (2) A．The exam was easier. B．Tom is sure that he will do better. C．The exam is easier than last one. D．Tom is afraid of failing the exam.

A．A.basal lanina B．B.basal layer C．C.dermis D．D.keratinocyte layer

The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen. In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide. The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere. Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful. Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants. What is the purpose of this passage？ A．Introduce some new ideas about the relationship between trees and carbon dioxide. B．Introduce recent condition of global industrial pollution. C．Call on people to plant more trees to reduce greenhouse gases. D．Point out that power companies should be responsible for the rising levels of carbon dioxide.