問題詳情
34.Why did it take so long to develop the x-ray microscope?
(A)Funds for research were insufficient.
(B)The source of illumination was not bright enough until recently.
(C)Materials used to manufacture x-ray tubes were difficult to obtain
(D)X-ray microscopes were too complicated to operate.
(A)Funds for research were insufficient.
(B)The source of illumination was not bright enough until recently.
(C)Materials used to manufacture x-ray tubes were difficult to obtain
(D)X-ray microscopes were too complicated to operate.
參考答案
答案：B
難度：適中0.428571
統計：A(2),B(3),C(2),D(0),E(0)
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