- 重点词汇
- 相关例句
四极杆和电子倍增器之间的偏转板能有效地使离子束偏转,并使噪声最低,最小可检分压强低于5×10-~(11)Pa。
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And then the rooms were very still while the pages were softly turned.
随后,屋里除了翻书页的声沙沙之外,便悄无声响了.
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Spring rainfall less drought and summer floods on agricultural production greater threat.
春季降水少,春旱、夏涝对农业生产威胁较大.
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