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【简答题】
W2_Talk_Gap-filling(1913/15) In this section you will hear a talk. You will hear the talk ONCE ONLY . While listening, you may look at the task on ANSWER SHEET ONE and write NO MORE THAN THREE WORDS for each gap. Make sure what you fill in is both grammatically and semantically acceptable. You may use the blank sheet for note-taking. You have THIRTY seconds to preview the gap-filling task. Now listen to the talk. When it is over, you will be given TWO minutes to check your work.
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【简答题】试说明热力状态、热力状态参数的含义及它们的相互关系。 表压力、真空度与绝对压力之间的关系如何? 画图2-12,并描述多变指数n取不同数值时,代表了哪种热力过程? 画图2-14,并分别列举制冷系数和供热系数的定义式。
【简答题】（-2）+4+（-6）+8+…+（-98）+100=______．
【简答题】用简便方法计算 ①100-98+96-94+92-90+…+8-6+4-2 ②（25+125）×8 ③（98+98+98+98）×25 ④785-（217+185） ⑤454+999×999+545 ⑥426+1999．