研究表明：气固相反应中，副产物较多，催化剂易失活，使用寿命短；
The results show that, when reaction proceeds in gas solid phase, more by product is produced and the catalyst is easily inactivated with short service life.
结束前九洞的短四杆洞，提供绝佳的弥补失分的机会。
Rounding off the front nine is a shorter par four that offers a great opportunity to make up some ground.
结束前九洞的短四杆洞，提供绝佳的弥补失分的机会。
Rounding off the front nine is a shorter par four that offers a great opportunity to make up some ground.
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