一只被检电流互感器的额定二次电流为5A,额定二次负荷为5VA,额定功率因数为1,则其额定二次负荷阻抗为()
A.0.15Ω
B.0.3Ω
C.0.2Ω
D.0.25Ω
参考答案:A
Can you tell me _____ the birdwatchers in Zhalong Nature Reserve? I only know that _____ of them are from our school.
A.the number of; one- thirds
B.a number of; one-third
C.the number of; one-third
D.a number of; two-third
下列哪种疾病不是病毒性心肌炎的鉴别诊断()
A.克山病
B.甲状腺功能亢进
C.二尖瓣脱垂
D.结缔组织病
E.肺心病