Nobody but doctors and those _______ by Dr Smith ______ to enter the patient’s room.

A．invited; is allowed

B．invited; are allowed

C．being invited; is allowed

D．being invited; are allowed

某事业单位利用财政性资金采购一套技术复杂且规格难以描述的非标准检测设备，能够制造供应该设备的生产厂商有限，比较适合采用的采购方式是（）

A．询价

B．竞争性淡判

C．单一来源采购

D．公开招标