代替
Sam has been appointed _____ manager of the engineering department to take _____ place of George.
Sam has been appointed \_\_\_\__ manager of the engineering department to take \_\_\_\__ place of George.
格构式轴心受压柱整体稳定计算时，用换算长细比代替，这是考虑_ ___。
格构式轴心受压柱整体稳定计算时，用换算长细比代替，这是考虑_ ___。D
It was from the earliest time _____ men began to study the natural phenomena and heavenly bodies.
It was from the earliest time \_\_\_\__ men began to study the natural phenomena and heavenly bodies.
二氟甲烷是性能优异的环保产品，它可以代替会破坏臭氧层的“氟利昂”用作致冷剂，试判断二氟甲烷的结构简式（ ）．
二氟甲烷是性能优异的环保产品，它可以代替会破坏臭氧层的“氟利昂”用作致冷剂，试判断二氟甲烷的结构简式（ ）．
“沉舟侧畔千帆过，病树前头万木春。”“芳林新叶催陈叶，流水前波让后波。”这两句诗包含的哲学道理是（ ）
“沉舟侧畔千帆过，病树前头万木春。”“芳林新叶催陈叶，流水前波让后波。”这两句诗包含的哲学道理是（ ）