区位内经济与区位外经济的联系和互补性、龙头作用及其发展活力与潜力的比较优势称为( )。
A.区位特色 B.经济特色 C.区位优势 D.经济优势
参考答案:B
The president, as well as his bodyguards, _______ to the nuclear station(核电站), _______ there was an accident 20 minutes ago.
A.have come ; which
B.come; in which
C.has come ; where
D.came; in where
总悬浮颗粒物含量过高或雾天采样使滤膜阻力大于10kpa时,不宜采用重量法测定总悬浮颗粒物()