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【单选题】
使用瑞利(Reyleigh)散射光强度公式,在下列问题中可以解决的问题是:A.
溶胶粒子的大小
B.
溶胶粒子的形状
C.
测量散射光的波长
D.
测量散射光的振幅
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【简答题】连线。 1. A. Put on your slippers. 2. B. Put on your boots. 3. C. Put on your sandals. 4. D. Put on your sneakers.
【简答题】听音选词。 ( ) 1. A. now ( ) 2. A. put up ( ) 3. A. one ( ) 4. A. thin ( ) 5. A. rain B. snow B. put on B. sun B. think B. train C. show C. put down C. son C. wind C. raining D. slow D....
【单选题】气割的原理是利用气体火焰的热能将工件切割处加热到（）后，以高速喷射的高压氧气流使金属剧烈燃烧并放出热量，同时将生成的熔渣迅速的排除从而形成割缝。
A.
燃点
B.
沸点
C.
熔点
D.
自燃点
【单选题】— Must I wait for you here now? — No, you ____. You may be back in half an hour. [ ]
A.
don't have to
B.
mustn't
C.
can't
D.
shouldn't
【单选题】You must do your homework now; you ________ computer games all the evening.
A.
have been playing
B.
are playing
C.
play
D.
played
【单选题】Now that you have a job, you must exert (努力) yourself in ______ you do at work. [ ]
A.
however
B.
no matter what
C.
no matter how
D.
whatever
【单选题】The bottle is ____ for us to put the ball in it.
A.
small enough
B.
enough small
C.
big enough
D.
enough big
【简答题】现在分词 1. read _________ 2. swim _________ 3. put _________ 4. write _________ 5. begin _________ 6. run _________ 7. stop _________ 8. eat _________
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