You are looking at the following data．Project A has a CPI of 0.8 and SPI of 1.2 and EV of 450．Project B has CPI of 1.2 and SPI of 0.8 and EV of 650．Which of the following statement is true ？（）

A．Project B is performing better because it has a higher earned valu

B．Project A has schedule slippage and project B is ahead of schedul

C．Crashing project A is a good optio

D．Crashing project B is a good optio

在航不对水移动的帆船，夜间应显示：（）.

A.垂直红、绿2盏环照灯，关闭舷灯与尾灯

B.垂直红、绿2盏环照灯，关闭桅灯、舷灯与尾灯

C.垂直2盏环照红灯

D.舷灯与尾灯