测爆仪显示10%LEL，该可燃气体爆炸下限为5%，则该可燃气体浓度为
B
暂无解析
Oursisbeautifulschoolwithalonghistory,____weareproud.
Theaeroplane____shewastravelingwasdelayedforthreehoursatleast.
Hehadalongtelephone( ).
Inasecond-handbookshop,Billycameacrossabookwhichhethoughtwascertainlya____edition.
Icanstillrememberthesittingroom____Iusedtositintheevening.