单项选择题
A.you first start to receive fuel B.hoses are being blown down C.final topping off is occurring D.hoses are being disconnected
In case of accidents（）the risk of sinking，all effective...
单项选择题In case of accidents（）the risk of sinking，all effective measures shall be taken to steer clear of the fairway to avoid（）the traffic.
A.involving／impeding B.involved／to impede C.involving／to impede D.involved／impeding
If you do not wear goggles and helmet，your chances of b...
单项选择题If you do not wear goggles and helmet，your chances of being（）will be greater.
A.beaten B.damaged C.hurt D.stricken
If the sling bumps（）the beams，serious accidents may fol...
单项选择题If the sling bumps（）the beams，serious accidents may follow．
A.at B.on C.into D.against
