( )途径之一是改进初冷工艺,使煤气在初冷的同时还进行脱萘。
A.脱萘 B.脱硫 C.脱苯 D.脱氰
参考答案:A
—I'm afraid I must be off now.
— .
A.No problem
B.Never mind
C.See you
D.It doesn't matter
《溶解乙炔压力容器安全监察规程》规定瓶阀应满足什么要求﹖