判断题 通常情况下，楼梯平台的净宽度应不小梯段的净宽度。

单项选择题 When his advertisement using the new digital technique drew as many as 5,000 responses overnight, he knew he ___________. A. was up to something B. was in something C. was onto something D. was on something

单项选择题 偏头痛的临床特点,以下说法正确的是( ) A. 多为偏侧头痛 B. 多为胀痛 C. 不会出现双侧头痛 D. 以上均正确