PRC和LPR都是二级基准时钟。

The intention of the（）is to schedule, organize and control all activities to achieve the project goal eventually.no matter how difficult it is and what kind of risks are there.

A、project work breakdown

B、project security authentication

C、project management

D、project flowchart

房间空调冷负荷与______有关。

A．设备、器具、管道的散热量

B．室内湿衣服水分蒸发带给空气的潜热量

C．渗透空气带入的热量

D．食品或物料的散热量

简述聚氨酯软泡沫必须破泡的原因

政府债券的风险主要是( )。

A．购买力风险

B．信用风险

C．经营风险

D．财务风险