胃十二指肠溃疡外科手术的绝对适应证是
A.溃疡病穿孔B.应激性溃疡C.瘢痕性幽门梗阻D.胃后壁溃疡E.溃疡病出血
参考答案:C
已知函数f(x)=sin(x+θ)+cos(x+θ)的导函数为g(x),若对任意实数x,都有g(x)+g(-x)=0则f(θ)等于( )
A.1
B.-1
C.0
D.1或-1,
Taiwan is _____ the south of China. [ ]
A. to
B. in
C. on