Exceptinrarecases,itisimpossibletoextinguishashipboardfireby().
A. removingtheheat
B. removingtheoxygen
C. removingthefuel
D. interruptingthechainreaction
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Whichofthelistedmaterialswouldbeconsideredasabuntingclass"C"fire?()
A. Fueloil
B. Wood
Celluloid
D. Electricalinsulation
与酸雨形成无关的因素是:()
A. NO
B. SO
C. KHPO
D. SO
AburningACmotorwouldbeconsideredwhatclassoffire?()
A. Class"A"
B. Class"B"
Class"C"
D. Class"D"
在一些多风海岛上,许多昆虫没有翅膀。导致这种无翅现象的最可能原因是:()
A. 遗传漂变
B. 人为捕猎
C. 自然选择导致的保护性适应
D. 以上都不对