Mr Wang _______ a watch.[ ]
A. doesn't has
B. doesn't have
C. don't have
D. don't has
B
下列选项中不符合大叶性肺炎的症状是:()
A.病变多累及一个大叶
B.纤维素性炎症
C.可发生肺间质变
D.常并发肺脓肿
一台汽轮发电机并于无穷大电网,其额定容量SN=31.25MVA,UN=10.5kV,cosφN=0.85(滞后),XC=7Ω,Y接法。发电机额定运行时的过载能力kM=1.8,则其空载电动势E0为()kV。(定子电阻忽略不计)
A.18.4
B.16.6
C.14.8
D.10.625