Based on the operational principle of on/off slip of continuous-circulation system, the forced state of drill pipe was clarified.

从钻井连续循环系统上卸扣卡瓦的工作机理入手，弄清了钻杆工作时的受力状态。

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Italian Enzo Maresca and Ernesto Chevanton were on target to help Sevilla move two points off the lead, while Espanyol slip to eighth after their first defeat of the season.

意大利在马雷斯卡和切万顿的进球帮助塞维利亚2球击败对手，而西班牙人在本赛季第一场失败后积分滑落到第8。

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Dalrymple lost both Ben Wright, caught at slip off Daggett, and Michael Powell, who was trapped in front by Hall, and then, in the final over of the day, the captain was caught at slip off Boje.

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Jayawardene also failed, caught by Runako Morton at second slip off Powell for three.

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His partnership with Graeme Swann was brief, the latter edging to slip off Wallace.

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