直线研磨运动的轨迹不但能获得较高的几何精度，同时也能得到较细的表面粗糙度。
参考答案：错
肝癌的早期症状是（）
A.持续性肝区痛
B.进行性肝肿大
C.呕血、黑粪
D.发热黄疸
E.食欲不振、乏力、体重下降
.
He had opened the curtains that night _______the other women would see him and Claire.
A．in case
B．even though
C．so that
D．unless
