已知⊙O的半径为10，P为⊙O内一点，且OP=6，则过P点，且长度为整数的弦有（ ）
A．5条
B．6条
C．8条
D．10条
答案：C
You are working on a software development project and there is 60% probability that development will be completed by the planned date and 70% probability that testing will be completed by the planned date．What is the probability that development and testing will be completed as per schedule ？（）
A．65%．
B．42%．
C．66%．
D．63%．
促进电子商务的应用和普及，首先应解决 （ ） 。
A．电子商务的宣传普及问题
B．企业MIS 建设问题
C．信息基础设施的问题
D．金融电子化的问题
