The parties to government procurement refer to the principal entities of all kinds that enjoy rights and undertake obligations in government procurement, including the procuring entities,the () and the procuring agencies.

A、users

B、servers

C、producers

D、suppliers

自动驾驶仪整个通道的组成包括：（）.

A.测量装置、计算装置、执行机构和控制装置

B.测量装置、计算装置和控制显示装置

C.测量装置、信号处理元件、放大装置、执行机构和控制显示装置

D.测量装置、信号处理元件、放大装置和执行机构