下列关于化合反应的定义叙述正确的是( )
A.物质在氧气中燃烧的反应
B.两种物质生成一种物质的反应
C.物质与氧的反应
D.由两种或两种以上的物质生成一种物质的反应
答案:D
A terrorist attack at Kunming Railway Station ,and 29 people in the event .
A.was happened , may be killed
B.happened , killed
C.happened , were killed
D.happened , are killed
甲数是108,是乙数的3倍.甲、乙两数的和是多少?