Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）
The purpose of compressing the air within the cylinder of a diesel engine is to （）
Pipes made of plastic are now widely used in building as they are light and do not become （）in water.
Compressed air is supplied by air compression to （）.
The compressed air is supplied by （） to the air reservoirs.
Air line lubricators are used in compressed air systems to lubricate （）.
It is very necessary that each cylinder （） before the charged air is compressed.
When building an IP multicast domain using PIM which mode assumes that other routers do not want to forward multicast packets for the group?（）
It is very important that each cylinder should be （） scavenged before the charged air is compressed.
If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.
The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.
This entrance is in_______ use :do not block it.
Which of the following professional greeting would you use if you do not know the recipient?
When sources do not have an author, use the key words of the title of the article you are going to cite.
Some self checkout machines do not accept cash so you will need to use a credit, ______ or gift card.
M: I don’t know how to use this new software?W: Why not ask Jack to help you?Question: What will the man probably do?
Suppose you phoned your friend Mary several times yesterday but she didn t answer your call at all. Write her an email to 1) find out what happened, and 2) ask if she need your help. You should write about 100 words. Do not use your own name. Use "Li Ming" instead. Do not write your address.
People do not know for sure when numbers came into use. It is not______for sure when numbers came into use.
Directions： Suppose you have to cancel your travel plan and will not be able to visit Professor Smith. Write him an email to 1）apologize and explain the situation， and 2）suggest a future meeting. You should write about 100 words on the ANSWER SHEET. Do not use your own name. Use“Li Ming” instead. Do not write your address.
Suppose last weekend you went to Brians home and enjoyed hospitality from his family. Write him a letter to 1) thank him, and 2) invite him to your home. You should write about 100 words. Do not use your own name. Use "Li Ming" instead. Do not write your address.
Write a letter to the president of your university to 1) suggest how to improve students physical condition, and 2) include the details you think necessary, You should write about 100 words. Do not use your own name. Use "Li Ming" instead. Do not write your address.
