海关所指的重要工业品是那些对整个国民经济相对十分重要的工业品。 ()
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The physicists propose that our attention ________ the use of special methods of thinking
A. would be directed towards
B. should be directed towards
C. is directed towards
D. directs towards
质量信息传递大体由_________组成。
A. 信源一信道一信源
B. 信源一信道一反馈
C. 信源一信道一新信源
D. 信源一信道一信宿
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