肺结核外科手术的适应证是()
A.结核性胸膜炎
B.复活的单侧纤维厚壁空洞,长期内科治疗未能使痰菌阴转者
C.双侧毁损肺
D.结核球
E.支气管内膜结核
参考答案:B
已知(a+b)2=1,(a﹣b)2=49,求a2+b2与ab的值
It's eleven p.m.. Mary is still working _____ the light. [ ]
A. from
B. in
C. at
D. to