Great as Newton was, many of his ideas today and are being modified by the work of scientists of our time.
A.are to challenge
B.may be challenged
C.have been challenged
D.are challenging
第4题
汽油机的()将高压电引入燃烧室,产生电火花,点燃混合气。
A.高压线
B.火花塞
C.分电器
D.电源
第5题
汽油机()将高压电引入燃烧室,产生电火花,点燃混合气。
A.高压线
B.火花塞
C.分电器
D.电源
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