The British codes are described as being______.
A. letters spaced out
B. numbers in order
C. sets of letters and numbers
D. letters and numbers separately
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Paragraphs 2 and 3 are written to______
A. discuss the cause of the decline of sciences power
B. show the authors sympathy with scientists
C. explain the way in which science develop
D. exemplify the division of science and the humanities
某梁悬臂受力情况如下图所示，其B点处的弯矩数值为()。
A. 1/2PL
B. 1/4PL
C. 1/8PL
D. 0
A．at every turnB．in turnC．to a turnD．by turns
A. at every turn
B. in turn
C. to a turn
D. by turns
A．whileB．if onlyC．long beforeD．if
A. while
B. if only
C. long before
D. if
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