[1501] The e x plosiv e range of a f u e l lies bet we en t he lower explosiv e li m it and th e ______
flash point B
ig ni tio n te m perature C
u pp e r ex p losive li m it D
fi re p ointK EY: C 一燃料旳爆炸范围在爆炸下限和爆炸上限之间
[15 0 2] The e xtern a l flot at ion bladd e r o f an imm e rsion s u it s hould b e inflated ______.A. only a f ter t wo hours in the w a te r B
onl y after f o ur hours i n th e wa te rC
b efore entr y into the w ater D
upon e nt ry into the waterKEY: D 浸水服外部旳漂移球片应当已进入水中就充气,[150 3] The e ye o f a h u rr i c an e i s su r r o unde d b y den s e b l ac k c um ul o n i mb us clouds which a re called ______
A.wall cl oud B
n i mb os tratus cl o ud C
ba r D
F un n el KE Y: A 台风眼去被很厚旳积雨云包围,这叫做云墙
[15 0 4] The eye of t he hu r ricane has ______.A
ve r y hi gh bar ometr