不孕的原因是
参考答案:输卵管原因
It is reported that many battles broke out in Middle East. What’s your _____ of the situation there?
A.assessment
B.anxiety
C.comprehension
D.consideration
试在坐标平面yOz内的直线2y-z=1上确定一点P,使P到点Q(-1,0,4)的距离最小.