Whichofthefollowingstatementsisleastlikelytocausetheignitionoffuelvapors?()
A. Staticelectricity
B. Anopenrunningelectricmotor
C. Loosewiring
D. Explosionprooflights
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沉井施工时,筑岛的尺寸,应满足沉井制作及抽垫等施工的要求,无围堰筑岛护道宽度,不宜小于()米。
A. 1.5
B. 2
C. 2.5
Afireinanelectricalgeneratorisconsideredtobe().
A. Class"A"
B. Class"B"
Class"C"
D. Class"D"
吊具泵跳闸原因是()。
A. 吊具上下架限位不到位
B. 开闭锁不到位
C. 伸缩不到位
D. 吊具顶销到位
Besidesheat,fuel,andoxygen,whichofthefollowingisnecessaryforafiretoexist?()
A. Chainreaction
B. Thermalaction
Chemicalocclusion
D. Pyrotechnicalreaction