职业道德的特点之一是（）。
A、可依性
B、表达形式多种多样
C、法律效力
D、约束性
参考答案：D
— _______, where's the bookshop, please?
— _______, I don't know. [ ]
A. Excuse me, Sorry
B. Excuse me, Excuse me
C. Sorry, Excuse me
D. Sorry, Sorry
背斜油气藏分为哪几种类型？
