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在计算每组散热器的散热面积时，散热器，内的热媒的平均温度采用()。
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对工艺性空调，有外墙时，地面传热形成的冷负荷应计算墙()m以内的地面传热形成的冷负荷。
It must have been after two o'clock in the morning when the last guests【B1】their leave, and although we had enjoyed their【B2】, my wife and I were quite thankful to shut the door【B3】them. We【B4】all the dirty dishes and glasses as they were, and after opening a few windows to let some fresh air in and the smell of stale【B5】out, we climbed into bed and fell asleep. I could not have been【B6】for more than half an hour when I woke with a【B7】smell of smoke in my nose. Still half asleep, I【B8】into the sitting room, and, there through【B9】clouds of smoke, I saw that one of the curtains was【B10】fire. I should have closed the windows then without delay, but【B11】I tried to beat out the flames with a folded newspaper.【B12】this failed I hastened into the kitchen to【B13】a bucket and fill it with water. At the same time I shouted to Barbara, who【B14】dialed 999 to summon the fire brigade【B15】coming to my aid. We had to work at top speed carrying buckets of water from the kitchen to prevent the flames,【B16】by the breeze from the windows, from spreading. We were unable to【B17】out the fire but we managed to keep it【B18】in check until the arrival of the firemen. Fortunately, they arrived promptly and they had little difficulty【B19】putting out the flames. For most of the【B20】of the day we worked hard.
【B1】
A．This evening.B．Tonight.C．Sometime next week.D．Tomorrow.
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
He was a funny looking man with a cheerful face, good natured and a great talker. He was described by his student, the great philosopher Plato, as "the best and most just and wisest man". Yet this same man was condemned to death for his beliefs.
The man was the Greek philosopher, Socrates, and he was condemned for not believing in the recognized gods and for corrupting young people. The second charge stemmed from his association with numerous young men who came to Athens from all over the civilized world to study under him.
Socrates' method of teaching was to ask questions and, by pretending not to know the answers, to press his students in to thinking for themselves. His teachings had unsurpassed influence on all the great Greek and Roman schools of philosophy. Yet, for all his fame and influence, Socrates himself never wrote a word.
Socrates encouraged new ideas and free thinking in the young, and this was frightening to the conservative people. They wanted him silenced. Yet, many were probably surprised that he accepted death so readily.
Socrates had the right to ask for a less penalty, and he probably could have won over enough of the people who had previously condemned him. But Socrates, as a firm believer in law, reasoned that it was proper to submit to the death sentence. So, he calmly accepted his fate and drank a cup of poison hemlock in the presence of his grief-stricken friends and students.
In the first paragraph, the word "yet" is used to introduce ______.
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