国家在什么情况下对乡镇企业实行一定期限的税收优惠？

一般电厂中都以（）作为备用电源。

水泵串联可以增加扬程，串联理想条件是参加串联的各台水泵流量要相互接近。

项目经理不懂项目的具体技术，可以采取以下何种管理模式？（）

A.有销售权

B.独裁式

C.民主式

D.自由式

按并购企业双方所在行业的相互关系，跨国并购通常包括（）.

A.纵向并购

B.横向并购

C.混合并购

D.直接并购

A client on prolonged bed rest has developed a pressure ulcer. The wound shows no signs of healing even though the client has received skin care and has been turned every 2 hours. Which factor is most likely responsible for the failure to heal

A．Inadequate vitamin D intake.

B．Inadequate protein intake.

C．Inadequate massaging of the affected area.

D．Low calcium level.