主生产计划是展开物料需求计划的主要依据，对从综合计划向具体计划的过渡起到了承上启下的作用。( )
参考答案：对
12. It is _________he often wins medals _______makes his parents proud of him.
A．what; that
B．that; that
C．that; what
D．/; that
下列哪个图标表示电缆沟（）
A.
B.
C.
