下列关于火场警戒要求的表述中，正确的是（）。
A.遇有重大火灾或重大灾害事故，火场指挥员必须强化联动作战意识，充分发挥相关部门和社会各界力量的作用。
B.设置警戒区时，要根据火灾或灾害事故的不同种类、性质，设置相应的警戒标识。
C.在实施警戒的过程中，要防止无关人员或围观群众随意进出火场。
D.警戒人员要做好个人防护，防止中毒、灼伤等事故的发生。
E.在警戒区的出入口处，应设置专职的警戒员，做好进入危险区域的人员、器材的安全检查，强调安全注意事项并做好记录，确保进入火灾现场的人员安全。
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诊断门脉高压最有价值的体征是( )
A．大量腹水
B．脾大
C．下肢浮肿
D．黄疸
E．食管吞钡X线检查
斗拱构件当中，方形木块称斗，弓形短木称拱，斜置长木称（）。
The fridge is considered a necessity. It has been so since the 1960s when packaged food first appeared with the label: "store in the refrigerator. "
In my fridgeless fifties childhood, I was fed well and healthy. The milkman came daily, the grocer, the butcher, the baker, and the ice cream man delivered two or three times a week. The Sunday meat would last until Wednesday and surplus bread and milk became all kinds of cakes. Nothing was wasted, and we were never troubled by rotten food. Thirty years on, food deliveries have ceased, fresh vegetables are almost unobtainable in the country.
The invention of the fridge contributed comparatively little to the art of food preservation. A vast way of well tried techniques already existed—natural cooling, drying, smoking, salting, sugaring, bottling…
What refrigeration did promote was marketing—marketing hardware and electricity, marketing soft drinks, marketing dead bodies of animals around the globe in search of a good price.
Consequently, most of the world’s fridges are to be found, not in the tropics where they might prove useful, but in the wealthy countries with mild temperatures where they are climatically almost unnecessary. Every winter, millions of fridges hum away continuously, and at vast expense, busily maintaining an artificially cooled space inside an artificially heated house—while outside, nature provides the desired temperature free of charge.
The fridge’s effect upon the environment has been evident, while its contribution to human happiness has been insignificant. If you don’t believe me, try it yourself, invest in a food cabinet and turn off your fridge next winter. You may miss the hamburgers, but at least you’ll get rid of that terrible hum.
Which of the following phrases in the fifth paragraph indicates the fridge’s negative effect on the environment().
A．Hum away continuously
B．Climatically almost unnecessary
C．Artificially cooled space
D．With mild temperatures
小说的三要素是人物、故事情节和自然环境。( )
由（）组成的系统，应由业务主管部门按系统进行汇总统计。
A.多个台站或设备
B.大于两个的台站或设备
C.大于十个的台站或设备
D.以上都不对