某运动员百米赛跑的成绩是10s，他到达终点时的速度是14m/s，他百米赛跑的平均速度是_____m/s．
10
The intention of the（）is to schedule,organize and control all activitiesto achieve the project goal eventually.No matter how difficult it is and what kind of risks are there.
A.project work breakdown
B.project security authentication
C.project management
D.project flowchart
维生素C中重金属的检查：取待测品1.0g，加水溶解成25ml，要求重金属的含量不超过10/100万。
应取标准铅溶液体积为（0.01mg/ml）（）
A.0.5ml
B.0.8ml
C.1.0ml
D.1.2ml
E.1.5ml
