一本好的教材,对培训活动而言,可取得事半功倍的效果。故创造性的开发教材,是培训目标达成重要保障和基础。
参考答案:对
—Which city would you like to______? —Fujian. I______ there twice.
A.visit, have gone
B.visit to, have been to
C.visit to, have gone to
D.visit, have been
列管式换热器中,管子的排列一般有直列和错列两种,当传热面积一定时,采用()排列对流传热系数稍大。
A.直列
B.错列
C.无法确定