言语指导对动作技能的学习有一种持久的定向效应。
参考答案:对
During the period when he was in hospital, I _____ him to give up smoking but he still smokes. [ ]
A. persuaded
B. advised
C. thought
D. suggested
丙烯干燥器备用速度过快,波动较大的是()。
A.碳三加氢反应器
B.高压脱丙烷塔回流罐液位
C.低压脱丙烷塔
D.碳二加氢反应器