工程项目施工进度管理任务完成的标志是( )。
A．颁发工程移交证书
B．竣工验收
C．工程结算完成且无争议
D．保修期结束且无争议
参考答案：D
在真空中两个带等量异种的点电荷，电量均为2×10-8C，相距20cm，则它们之间的相互作用力为______N．在两者连线的中点处，电场强度大小为______N/C． （K=9.0×109Nm2/c2）
Which of the following statements regarding forward contract dealers is FALSE()
A. Forward contract dealers are often banks.
B. Dealers are compensated through up-front payments by the parties to forward contracts.
C. Dealers offer long and short forward contracts at different prices.
