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当前学科：采掘电钳工
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隔爆电气设备不传爆的三要素是指防爆面的：（），（），（）。
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当地震、火灾发生时，人会做出适应性的生理心理改变，这种情绪状态称为（）。
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水处理系统的日常监测包括（）
角膜血染发生的因素错误的是（）
机关管理制度的修改原因主要有（）
When Betty Burwood won the national lottery, she and her husband, Bill, moved into abeautiful big bungalow and she bought herself a very expensive pearl necklaceThe following summer, the Burwoods decided to throw a party. Early on the afternoonof the party, Betty took her new silk dress out of the wardrobe and put her expensive pearlnecklace on her dressing-table ready to put on in the evening. Then, she went to see how thepreparations for the party were goingThe catering company had just arrived - a cook, Mrs. Moore, and her two helpers,Nancy and Harriet. They were all in the kitchen unpacking the piles of boxes which they hadbrought with them. Soon, the fourth member of the team, Charlie Chivers, arrived on hisbicycleBy six o' clock, everything was ready. The garden looked magnificent - with smallround tables and colorful chairs and sun shades. The food and drink was all laid out in thekitchen, ready to be brought out when the guests arrivedAt ten past six, Betty went to her bedroom to get ready. She showered and put on herbest silk dress. It was when she was brushing her hair that she realized that her pearls werenot on the dressing-table. "Bill," she said, "have you moved my pearls?" "No, dear,"answered Hill, "where were they?" "1 put them on the drussing-tabie this afternoon andthey're not here now. ""Are you sure?" asked Bill. "Maybe you put them down somewhereelse, or maybe you,ye moved them"For a quarter of an hour they searched for the missing pearls, but couldn't find themanywhere. It was then that they decided they must call the policeSoon, Inspector Morgan arrived and started to question all the suspectsRead Passage 1 and then try to give short answers 协 Questions 1-5. Write your answers on theAnswer Sheeti. Why could Betty afford an expensive necklace?2. Why did she take her necklace out early in the day?3. How many people were there in the catering company?4. What do you think was in the boxes?5. Did the Burwoods call the police after they couldn't find the pear's?Read again and then fill in the following blanks numbered 6-10 with the information from the passage. Write you answers on the Answer Sheet
（）指灭火器的控制阀开启或达到相应开启状态时起，到灭火剂开始从灭火器喷嘴喷射的时间。
关于阀门的安装要求，正确的说法有( )。
基站全向天线增益范围一般在（）dBi至（）dBi。
在滴定分析法测定中出现的下列情况，不会导至系统误差有（）。