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Timely treatment of photocoagulation and (or) cryotherapy for prethreshold type 1 and threshold disease of ROP may lead to famous prognosis.

对阈值前病变1型和阈值期ROP进行及光和(或)冷冻治疗具有比较满疗效。

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The deep formation has a high degree of hardness and abrasivity;the bit type selection is difficult and the ROP is low especially under the high density mud.

深部井段地层硬度性强,钻头选型困难,特别是在密度条件下机械钻速低。

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3G, 401(K), a,

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