比较优势理论与竞争优势理论主要有哪些区别？

Great Expectations ______ my favorite book, which ______ by Charles Dickens, and ______ as classic literature nowadays.

A．is; was written; is seen

B．are; are written; are seen

C．is; had been written; is seen

D．are; were written; is being seen

根据砾石成分的复杂程度可将砾岩分为（）2类。

A、单成分砾岩和复成分砾岩

B、粗砾岩和细砾岩

C、底砾岩和层间砾岩

D、砾岩和角砾岩

亲人的意外死亡属于危机介入模式中的()。

A.成长危机

B.社会危机

C.情境危机

D.自然危机

什么叫碱性氮化物？

具有“我不需要遵守条例”或“不用你告诉我做什么和怎么做”想法或表现的飞行员，可认为他已具有（）.

A.冲动性态度

B.炫耀态度

C.反权威态度