听力原文: U. S. -led coalition forces in Afghanistan say American and Afghan troops have rescued 5 civilian contractors, pinned down by Taliban militants after their helicopter landed in Gazni province south of Kabul. A statement said U.S. special forces and an Afghan police rapid reaction team rescued the contractors late Thursday after receiving a distress call. It said coalition troops killed three Taliban militants, who opened fire on a helicopter when it made an emergency landing due to mechanical problems. The coalition statement did not mention the nationalities of those rescued or the company they worked for.
Who rescued those civilian contractors?
A.Afghanistan troops.
B.American troops.
C.Afghanistan-led coalition forces.
D.U.S. -led coalition forces.
第3题
是液化石油气瓶内介质处于气—液平衡两项共存状态时,气相部分所占的空间。
A.水容积
B.气相空间
C.气体空间
D.剩余空间
第6题
关于液化石油气的状态,下列描述正确的是()
A.由液相变为气相提及扩大25倍,爆炸极限通常为1.5—10%
B.由液相变为气相提及扩大250倍,爆炸极限通常为1.5—10%
C.由液相变为气相提及扩大30倍,爆炸极限通常为1.5—10%
D.由液相变为气相提及扩大300倍,爆炸极限通常为1.5—10%
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