农业生产计划是单位或农户在农作物生产之前预先拟定的具体生产的内容和措施。
参考答案：对
That activity was great. So it_______our teacher very much. [ ]
A. please
B. pleased
C. pleasure
D. pleased to
液力偶合器的缺点之一是：对电动机的传动效率降低了（）。
A.2%～3%
B.3%～4%
C.4%～5%
D.5%～6%
