二级吸气温度高的原因之一是（）
A、一级排气温度高
B、氢气流量大
C、氢压机效率高
参考答案：A
—What do you think of the film So Young directed by Zhao Wei?
—Wonderful. I think it’s than the other films about youth in recent years.
A．the best
B．the worst
C．much better
D．much worse
何谓宽孔距爆破？宽孔距的密集细说（m）如何选取？
