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- Conte found the answer in 1795.By mixing refined graphite powder with clay, then heating it,he produced a firm hard lead. German researchers later perfected the method. 1795年，康特找到了問(wèn)題的答案。把經(jīng)過(guò)精煉的石墨粉末混合以泥土，然后進(jìn)行加熱燒結，他生產(chǎn)出了牢固而堅硬的“鉛”。德國的研究員其后又完善了這一方法。
- Suitable for coring in medium hard formation with abrasiveness. Core recovery rate is high. 適用于帶研磨性的中硬地層取芯，取芯收獲率高。
- Suitable for coring in very hard formation with abrasiveness. Core recovery rate is high. 適用于高等硬度及研磨性的地層取芯，取芯收獲率高。
- Medium parabolic profile and heavy cutter density provides high ROP in medium hard formation with medium compressive strength and small interbedded layers. 中等拋物線(xiàn)冠部和較密布齒使其在中等抗壓強度的中硬地層以及薄夾層中能有良好的鉆井速度.
- Because of the low penetration rate and loss of fault in block 32 and 53 in YEMEN,the problem of loss was successfully salved by adopting the foam drilling fluid and accelerated the drilling speed in hard formation by applying the air hammer. 也門(mén) 32區塊和 5 3區塊地層可鉆性差、存在斷層漏失 ,采用泡沫鉆井液有效地解決了井漏問(wèn)題 ,應用空氣錘鉆井加快了硬地層的鉆進(jìn)速度 ;
- KQC series of air hammers used in gas drilling can solve certain problems,such as lower ROP(Rate of Penetration) and well deviation,which occurred in mud drilling in above medium hard formation. 在油田氣體鉆井中使用KQC系列空氣錘,解決了泥漿鉆井在中硬以上地層中鉆速慢、易井斜的難題。
- The firm will go under unless business improves. 生意若無(wú)起色，公司非垮不可。
- Our firm is likely to reap a big profit this year. 今年我們公司很可能獲得巨額利潤。
- The firm repaid her hard work with a bonus. 公司發(fā)給她獎金以酬謝她的辛勤工作。
- Thisseries of bit is suitable for drilling medium hard to hard formations with high compressive strength and medium abrasiveness. 適合在中硬至硬的高抗壓強、中等研磨性的地層中使用。
- Largely for the inserts and buttons of percussion bits and tricone bits to ciut medium-hard,hard,hard,and very hard formations. 主要用作沖擊鉆、牙輪鉆具的釬片、球齒、鑿進(jìn)中硬巖層、硬巖層以及緊硬巖層。
- It is hard to sleep without a cooler in this room. 沒(méi)有空氣調節器，在這間屋里很難入睡。
- The firm's tender for the supply of timber has been accepted. 那家商號的供應木材投標已被接受。
- The name and address of the firm are embossed on its paper. 商號的名字和地址凸印在信箋上。
- Design of PDC bit for hard formation 硬地層PDC鉆頭設計的探討
- In the recession, our firm go through a bad time. 我們公司在經(jīng)濟衰退時(shí)期歷盡艱辛。
- Our firm is stacking up pretty well these days. 我們公司目前情況相當不錯。
- How long do you intend to stop with the firm? 你打算還為公司工作多久？
- I am speaking for all the workers in this firm. 我代表公司全體工作人員講話(huà)。
- He travels in carpets for a big London firm. 他為倫敦的一家大公司到處推銷(xiāo)地毯。
