The line noise is a primary low frequency component of self-noise in submarines.
线谱噪声主要集中在自噪声的低频段。
The resources of natural rutile in our country is primary low-grade ore, eclogite-type rutile deposit is characterized as large, thick ore body, easy to exploration and mining.
我国天然金红石资源绝大部分为低品位的原生矿石，榴辉岩型金红石床具有规模大，矿体厚，易于勘探和开采等特点。
The resources of natural rutile in our country is primary low-grade ore, eclogite-type rutile deposit is characterized as large, thick ore body, easy to exploration and mining.
我国天然金红石资源绝大部分为低品位的原生矿石，榴辉岩型金红石床具有规模大，矿体厚，易于勘探和开采等特点。
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