已知一定温度时:N2(g)+3 H2 (g) 2NH3(g)。当生成2molNH3时,放出热量为92kJ,在相同温度和压强下,向密闭容器中通入3mol H2和1mol N2,达到平衡时放出热量为Q,则下列关系式中正确的是 ( ) A. Q=92 kJ B. Q< 92 kJ C. Q> 92 kJ D. Q=92×2 kJ14.-Excuse me.Can you tell me what time it is now?----Sorry,I .My watch doesn't work.( )A.can'tB.may notC.mustn'tD.needn't