富燃性火焰
参考答案：
助燃气少于化学计量的火焰。
It was very late at night, he still went on . [ ]
A. works
B. worked
C. working
D. work
测得利多卡因的消除速度常数为0.3465h-1,则它的生物半衰期为
A．4hB．1.5hC．2.0hD．0.693hE．1h
