目前槽式太阳能热发电系统已进入商业化阶段，塔式和碟式处于中试和示范阶段。
参考答案：对
______ that it was going to snow, the climbers decided to put off their attempt on the highest peak.
A．Having been told
B．Having told
C．Told
D．Telling
以刺激性干咳或阵咳症状为主的患者宜选（）
A.羟甲唑啉
B.苯丙哌林
C.克伦特罗
D.羧甲司坦
E.盐酸吗啡
