【简答题】The secret of s successful school __________ effective co-operation between professional leadship, the goverment and the local authority.A. lie down B. lie on C. lie to D. lie in
【单选题】The secret of a successful school consists in effective co-operation between professional leadership, the government and the local authority.
【简答题】制备聚乙烯醇的单体是什么?为什么?请写出制备聚乙烯醇工艺流程及各化学反应方程式。
【单选题】The successful operation of any engine or machine and ____ depend on effective lubrication.
A.
their no trouble period
B.
their freely trouble period