休克病人，血压低，脉搏＞140次/分，尿量极少，宜选用下列哪种血管活性药物( )

A．肾上腺素

B．去甲肾上腺素

C．异丙肾上腺素

D．多巴胺

E．麻黄素

In planning a presentation that advocates a decrease in the client-to-nurse ratio from 8:1 to 6:1, a nurse should emphasize its effect on（）

A. institutional resources.

B. standards of practice.

C. client-care quality.

D. nursing recruitment.