What is the principal idea of the article concerned about？

A . 正确 B . 错误

A . Corrosion from the shifting liquid B . Rupturing of bulkheads from the shifting liquid C . Loss of stability from free surface effect D . Holing of the tank bottom from the weight of the shifting liquid

A . TCP B . Task C . Monitor D . Dispatcher E . Shared Server F . Shutdown addre

A . Sea water is heated to boiling temperature under a vacuum B . Sea water is passed over heated plates in a thin film C . Heated sea water is injected into a vacuum chamber D . Sea water is forced through a heated eductor

Woman: I'd appreciate that very much. Man: One of the oldest mechanical engineering areas is machine design. First, we need to know the purpose, of a particular machine, whether it's a crane or a tool or a steam engine. Then, if we know the loads that this machine will carry, we can make the most efficient use of the materials we have. Woman: I see. Is heating included in this field？ Man: Oh, yes. Heating, refrigeration, and air conditioning rely quite a lot on thermodynamics and theories of heat transfer. The goal is to make the most efficient use of power. This area can be quite involved with mathematics. Woman: I've heard of the Carnot cycle. Does this concern the mechanical engineer？ Man: Very much so. The whole field of internal combustion engines is based on the principles set out by Carnot. The mechanical engineer deals with two and four-cycle engines, gasoline and diesel engines, gas turbines, and the like. Woman: Isn't that part of automotive engineering？ Man: Yes. This is one of our largest industries. Woman: What about the aircraft industry？ Man: Of course. Aeronautical engineering became a very large field with the widespread use of airplanes. Now, with space travel, it promises to grow even larger. Woman: Well, you've been most helpful, sir. Man: Not at all. Come in again. 27.Why has the woman come to the man's place？ 28.What is the man's field of research？ 29.Which of the following subjects is involved in mechanical engineering？ 30.Who was Carnet according to the man？ (47) A．She is planning to buy a refrigerator. B．She is interested in fashion design. C．She wanted to know something about a subject. D．She asked the man to help her find a job.

A.The price of Beijing's office space rises higher B.Different costs of office space all over the world C.The cost of Beijing's office space ranks the top D.Air pollution doesn't influence Beijing's office space

A．organically grown foods are nutritious. B．how to buy organically grown foods. C．what does organically grown foods mean？ D．a general standard should be established to regulate the organically grown produce.

A．The objections of death penalty have become less severe. B．The death itself is considered inhumane and unacceptable. C．Death penalty opponents only care about how one is put to death. D．The "hygienic" way of execution is even more barbaric. 此题为多项选择题。

A．He is surprised by it. B．He disagrees with it. C．He thinks it is too soon to tell. D．He is alarmed by it.

A．Burj Khalifa is an amazing building with many interesting features． B．Burj Khalifa is the tallest building in the worl D． C．Burj Khalifa opened to the public in 2010．

A．Production and distribution of goods and services B．Providing a means of payment and facilitating the saving and investment process C．Directing the flow of goods and services from producer to consumer D．None of the above

A．Americans should pay the same rate of tax. B．Companies and the wealthiest citizens must pay higher taxes. C．The current tax rate should be increased sharply. D．Republican opponents must cooperate with the government.

A．Exporter B．Importer C．Payer D．Agent