单项选择题
Which is not the right way to hold a wine glass? A、To grasp its post by the forefinger B、To grasp its post by the middle finger and the thumb C、The little finger on the bottom of the glass D、To grasp its post by the little finger
问答题 What skills should an applicant have if he/she wants to apply for the job with Washtenaw Community College?
问答题 机构中的复合铰链是指由（ ）个或以上构件组成同一回转轴线的转动副。
单项选择题 若分散相固体微小粒子的表面上吸附负离子，则胶体粒子的z电势（ ）。A. 大于零B. 小于零C. 等于零D. 等于外加电势差
