直挂云帆济沧海。(《行路难》(其一))“直”“济”是什么意思?
以人们对住宅的知识、态度、使用或反应为依据对市场进行细分,这种细分的依据称为()。
A. 人口细分
B. 行为细分
C. 地理细分
D. 心理细分
某患者服一催眠药,该药F为50%,Vd为10L,t为2h,当测其血浓度1.25mg/L时,该患者已睡了()
A. 3h
B. 4h
C. 5h
D. 6h
E. 7h
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()
A. Exhaust temperatures
B. Raw water pressure
C. Lube oil pressure
D. Air box pressure