休克患者血压低，尿量少，首选的血管活性药为（）
A.多巴酚丁胺
B.去甲肾上腺素
C.肾上腺素
D.异丙肾上腺素
E.多巴胺
参考答案：E
Nominated banks refer to the banks which are authorized to use the L/C．If the credit stipulates to be provided to any banks，then any banks are nominated banks．( )
常用的低压交流电弧工作电压为（）
A、110~220
B、170~300V
C、220~380V
D、110~380V
