可燃气体的燃烧性能常以（）来衡量。
A、火焰传播速度
B、燃烧值
C、耗氧量
D、可燃物的消耗量
参考答案：A
What a table! I’ve never seen such a thing before. It is____long.
A．half not as wide as
B．wide not as half as
C．not half as wide as
D．as wide as not half
上影线越长，下影线越短，阴线实体越短或阳线实体越长，越有利于多方占优。( )
