工程造价计价除具有一切商品价格运动的共同特点以外，还具有自身的（）等特点。

A、连续性计价

B、单件性计价

C、一次性计价

D、多次性计价

The following information is available about a particular task in your project plan：early start(ES)，25 days；late start(LS)，30 days；early finish(EF)，50 days；late finish(LF)，55 days．Based on this information。you can deduce that （）．

A．the project float is 5 days

B．the project may get delayed

C．the task is not on the critical path

D．the task is on the critical path