下列与免疫功能无关的疾病是[ ]
A.过敏性鼻炎
B.血友病
C.艾滋病
D.系统性红班狼疮
答案:B
During the summer holiday season it is difficult to find a (n) ______ room in the hotels here.
A.empty
B.vacant
C.free
D.deserted
变电设备变更(异动)类型包括()。
A.投运
B.报废
C.退运
D.修理