选择题：下列哪项不是群体健康状况评价间接指标（ ）A、综合指标B、死亡指标C、卫生保健指标　D、社会经济指标

9(5.0分) 5.0After careful consideration, we have decided to accept their ____.A)o

于制冷原理,以下说法不正确的是( )

卡诺制冷循坏的制冷系数与( )有关。

After he gave a report about the school, Mr Wang _______ the visitors around it.

直线方位角与该直线的反方位角相差__