静止物体受到合外力随时间变化图象如图所示,它的速度随时间变化的图象是图中的哪个
A.
B.
C.
D.
答案:A
— Whom did you ________ the packet at the post office?
—Jack. There________ masses of work for him to do, but he managed to finish the work as required.[ ]
A. have fetched; was
B. have fetch; were
C. have to fetch; were
D. have fetch; was
编制成本计划时,施工成本可以按成本构成分解为()。
A.人工费、材料费、施工机具使用费、规费和企业管理费
B.人工费、材料费、施工机具使用费、措施费和企业管理费
C.人工费、材料费、施工机具使用费、规费和间接费
D.人工费、材料费、施工机具使用费、间接费、利润和税金