哺乳的正确体位（）
A、母亲放松舒适
B、头与身体呈一直线
C、婴儿下颏贴 * *
D、以上都是
参考答案：D
Bring an extra pencil with you ___ something goes wrong with this one during the exam. [ ]
A. in case
B. in case of
C. so that
D. in order that
正方形布置的成组螺母的旋紧，必须从一边逐个拧紧
