查询词典 key ring

The target compound was cut off from the middle of the two benzene ring of Biphenyl Tetrazole and the key step was accomplished through Suzuki Coupling reaction.

第二部分：抗高血压药物——缬沙坦的新合成路线研究我们分别以对溴甲苯，对溴苄溴和对溴苯甲醛为起始原料分三条路线完成了缬沙坦的全合成。

Total synthesis of CET was accomplished by two routes through a conceptually novel strategy featuring a transannular reductive rearrangement as the key transformation for the construction of the core pentacyclic ring skeleton of CET.

我们采用了全新的合成策略，以氮原子参与的跨环还原重排为关键反应，通过两条路线分别成功地合成了三尖杉碱。

President of cereal song whole world holds the Ke Shimite in CEO dust concurrently this year high-key visit Hua Zhi brigade to just ring down the curtain, this week cereal song is encountering one picket makes his rusty awkwardly however " scandal ".

谷歌全球董事长兼CEO埃里克·施密特今年的高调访华之旅刚刚落幕，本周谷歌却尴尬地遭遇着一桩令其恼火的&丑闻&。

By the use of CAD method to carry out the research on key problems of three ring typed less teeth difference reducer-the inner and outer gears have to be designed by adopting modified transmission was advanced. And to study a method for carrying out numerical calculation by adopting the powerful functioned mathematical software MATHCAD in the solution of coincidence extent on less teeth differenced internal messing and in iterative computation for equation set of interference coefficient of tooth profile overlapping.

提出用CAD法研究三环式少齿差减速器设计的关键问题―内外齿轮必须采用变位传动的设计，并研究在求解少齿差内啮合的重合度和齿廓重叠干涉系数方程组的迭代计算中，选用功能强大的数学软件MATHCAD进行数值计算的方法。

As Joel Barker jiggled the key in his door lock one morning, his phone began to ring. Dumping his briefcase on the side chair, he grabbed for the receiver.

某日上午 Joel Barker刚进门，电话就响了，他把手提箱往旁边的椅子上一甩边便抓起听筒。

In the BEPC electron positron storage ring, the bunch length and its lengthening are quite important characters. It determines the efficiency of getting physical events and the luminosities achievable, and it plays a key role in the upgrade of BEPC.

在北京正负电子对撞机中，正负电子束团的长度及其拉伸是束流性能重要指标之一，它直接影响到物理实验的效率，对BEPC的改进和性能进一步提高也起着关键的作用。

The stability of the apron slabs on the arch ring of the inverted arch plunge pool is one of the key technologies to relate whether it can be safely operated under action of the high water head and the large discharge.

反拱水垫塘拱圈底板块稳定性是其在高水头和大流量作用下能否安全运用的关键技术之一。

Based on these hot and key spots in construction of high dams at present, Combining one of the 973 plan projects: Study of Global Stability of Geology Engineering System under Interaction of Several Factors(NO.2002CB412707), the dissertation mainly studies the stability anomaly and corresponding shape optimization. The main contents are as follows:The dissertation advances stability analysis method of arch dams based on arch-cantilever method, that is, the stability of arch ring and cantilever are analyzed respectively based on arch-cantilever method and corresponding formula of stability calculation is established. So the calculation methods of dam stress and stability are unified.

围绕目前高拱坝建设中的热点和重点问题，结合973计划课题：多因素相互作用下地质工程系统的整体稳定性研究(编号 2002CB412707)，重点研究高拱坝的稳定转异以及体形优化，现将主要内容归纳如下：本文提出基于拱梁分载法的拱坝稳定分析方法，即在拱梁分载法的基础上，分别分析拱圈和悬臂梁的稳定，建立相应的稳定计算公式，统一坝体结构稳定和应力计算方法。

Mahina leather, calf leather trimmings and microfiber lining,Hook closure secured by a flap and clasp with the Louis Vuitton signature,Internal zippered pocket and a D-ring for attaching a pouch or key holder,Side buckles for adjusting the size of the bag,Base studs for extra protection.

Mahina皮革质地，小牛皮饰边，微纤维衬里，金色黄铜配件，钩扣开合外加垂盖设计，提高安全性，按扣上带有路易威登字样，内设拉链袋和D形环，便于系扣小手袋或钥匙包，侧面设有调整包袋大小的带扣，底部护钉可加强保护。

Mahina leather, calf leather trimmings and microfiber lining.Golden brass pieces,Hook closure secured by a flap and clasp with the Louis Vuitton signature,Internal zippered pocket and a D-ring for attaching a pouch or key holder,Side buckles for adjusting the size of the bag.

Mahina皮革，小牛皮饰边和微纤维衬里，金色黄铜配件，钩扣开合，外有垂盖提高安全性，钩扣上带有路易威登字样，内设拉链袋和D型环，用于系扣小袋或钥匙包，侧面搭扣可调整包袋大小。

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。