图示结构,EI=常数,力法方程中的δ11=448/(3EI).()

13. Words may fall into __________ and functional words by notion. ( ) A: derivational words B: content words C: compound words D: grammatical words

2013年我国水稻的亩产约为（）千克。 A: 448 B: 455 C: 433 D: 463

What are formal words? A: learned words B: literary words C: big words D: colloquial words

What words are the prominent words? A: the first words of a sentence B: the words that carry the meaning of the sentence C: the words that are the least important words and ideas D: the words that have one syllable

Which type of words has new members? A: closed-class words B: invariable words C: most grammatical words D: open-class words

U2 Active Words: A: Match the words(副本) Match the words

Which type of the following words is the most forceful ones in a speech? A: Short words B: Complicated words C: Direct words D: Specific words

What types of signal words do we usually use? A: addition words B: comparison/contrast words C: illustration words D: cause-and-effect words

448、改革开放的方针政策是在哪一年提出的?( ) A: 1976 B: 1977 C: 1978 D: 1979