两周多

One work is a travelogue documenting the many official overseas trips he took. The other is a three-volume set of his "Selected Works", which went on sale on August 10th, a week before his 80th birthday.

这两套新书其一为记录江泽民多次海外出访的旅行见闻讲演集，另外一套则是三卷本的《江泽民选集》，选集在江泽民80岁生日的前一周，8月10号开始销售。

Methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling ProTaper rotary instruments using step-down technique,and by K files using step-back technique for control.All teeth were obturated with lateral condensation methods.The efficiency of preparation was analyzed with ra-diographs before and after operation.

选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用ProTaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用K锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的X线片，评价后牙根管预备效果。

objective to evaluate clinical effect of the handling protaper nickel-titanium rotary instruments in preparation of canals of posterior teeth.methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling protaper rotary instruments using step-down technique,and by k files using step-back technique for control.all teeth were obturated with lateral condensation methods.the efficiency of preparation was analyzed with ra-diographs before and after operation.results no transportation,apical blockage and ledge were found in test.the technique could keep canals smooth.there were two ledge,one instrument fracture and nine transportation in control.the operative time was shorter and post treatment pain seldom occurred in handling protaper group.conclusion the handling protaper niti rotary instruments can prepare the canals effectively and safety.after the preparation,the canals could be easily washed,sterilized and filled.it is an efficient instrumentation method for posterior teeth's canals and be used widely.

目的 评价手用protaper预备后牙根管的临床效果。方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用protaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用k锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的x线片，评价后牙根管预备效果。结果试验组无根管偏移、根尖阻塞、台阶，且根管壁平滑流畅，无器械折断等并发症发生。对照组有2例台阶形成，器械折断1例，根管偏移9例。试验组操作时间短且术后疼痛轻微。结论应用手用protaper预备后牙根管快速、安全，成形效果好，易于根管冲洗消毒及填充，可视为临床上预备后牙根管的有效方法。

Aluminium prices started the second week of July with a spurt above US$3,300/t on the back of production woes coming from the Shanxi region in China. Previous attempts to breach the US$3,100/t barrier in June and May were short lived with prices not finding the support needed to stay above those levels. Aluminium bounced back with renewed strength in July on further power driven supply fears and new long positions entering the market. In June momentum came from production disruptions in UK (at the 145,000 tpy Holyhead smelter) and India (at the 360,000 tpy Angul smelter) and news that two smelters in the US (Glencore's 168,000 tpy Columbia Falls and Alcoa's 267,000 tpy Rockdale smelters) were curtailing their production levels on the back of prohibitive power prices. LME 3M prices tested the US$3,200/t level at the end of the month but the bulls appeared to hesitate to bridge that mark retreating towards US$3,150/t at the beginning of July.

中国山西的生产危机推动铝价在7月份第二周周初站上3，300美元/吨。5月份和6月份铝价试图突破3，100美元/吨的关口，但这仅是昙花一现，铝价并没有找到站上这个价位的支撑。7月份铝价反弹，电力危机引发供应担忧以及新的多头进场推动铝价走强。6月份，英国（年产能145，000吨/年的Holyhead冶炼厂），印度（年产能360，000吨的Angul冶炼厂）以及美国两座冶炼厂（Glencore公司旗下年产能168，000吨的Columbia Falls冶炼厂和Alcoa公司旗下年产能267，000吨的Rockdale冶炼厂）因电价上涨宣布减产，从而为铝价走势提供了动能。6月末，LME三个月期铝价格上探3，200美元/吨这一价位，但市场做多动力不足，铝价在7月初回调至3，150美元/吨。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。