在化学反应2XY2+Y2====2C中，C的化学式应为[ ]
A.X2Y
B.XY2
C.XY3
D.X3Y
答案：C
重症肌无力患胸腺瘤者主要是_________患者，以_________性居多。
-- A latest Yangzhou Daily, please!
------ Only one copy left. Would you like to have , sir?
A．one
B．it
C．this
D．that
