A.1A,50Hz,30°
B.1A,100Hz,-30°
C.0.707A,100Hz,30°
D.0.707A,50Hz,30°
[单选题]A.层流B.过渡流C.无法判断D.湍流流动
[单选题]A.1cmB.2cmC.2.5cmD.3cmE.4cm
[单选题]A.肺功能基本正常B.肺功能轻度减退C.肺功能显著减退D.肺功能严重减退E.呼吸衰竭
[单选题]A.三相熔断器B.二相熔断器C.已熔断的一相熔断器D.已熔断的一相熔断器和相邻的一相熔断器
[单选题]A.15Ω,240V,80VB.60Ω,240V,160VC.15Ω,480V,160VD.60Ω,480V,80V
[单选题]A.增大0,的分压B.升温C.使用催化剂D.增加C的浓度