题目：
The earned value technique is a commonly used method of performance measurement．It integrates project scop,schedule,and cost measures to help the project management team assess project performance.If aproject's Cost Performance Index(CPI=EV/AC) value less than 1.0，it means that______。
A．the cost savings for work completed
B．the project is ahead of its planned schedule
C．the cost overrun for work completed
D．less work was completed than was planned
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：在生理层次的需求满足后，亲友和同事的探视让患者感受到关怀、友谊、归属，满足了患者的爱与归属的需要。
