小的环

Requests on resistance of corrosion destructibility of sealing interfaces that related to sealing up and cementing exercises in petroleum engineering are more and more of rigidity. It is urgently needs to resolve all sorts of problems that affect interface bonding quality. Conventional cement slurry design resist the destructive function worse, and can't like to satisfy the request to carry on latter production such as perforation, acidify, fracture etc.

常规油井水泥抵抗破坏的性能较差，不能很好满足水泥环抗冲击振动以及射孔、压裂等各种变形破坏的要求，这在一定程度上限制了小间隙、大位移、定向与水平井等特殊钻井工艺技术的发展，也制约了后期压裂、酸化等诸多开发工艺措施的实施。

He forgot that the "Central blocking, non-sheltered Day","wearing a short brown knot live in repeated air scoop" the hardships of life, in order to in this small world in to satisfy the demands of his nature, a pair of homing birds go hand in hand over his eyes, he "There is there is true, others want to forget words dialectic."

他忘却了那"环堵萧然，不避风日"、"短褐穿结，箪瓢屡空"的艰辛生活，为能在这片小天地里放逸他的天性而满足。刹时，一对结伴归巢的鸟儿掠过他的眼前，他怡然自得："此中有真意，欲辩己忘言。"

We have proposed the switching adaptive control law for the systems and designed the Lyapunov function in this thesis. It is proved that the proposed switching adaptive control law guarantees the solutions of the nonlinear systems boundedness and convergence of the tracking error to a residual set based on the Lyapunovs stability theory. The residual set can be made arbitrarily small by choosing a certain design parameters.

文中设计出了这类系统的切换自适应控制律，并构造出相应的Lyapunov函数，基于Lyapunov稳定性理论证明了系统在所设计的控制律作用下，闭环信号都有界并且跟踪误差收敛到一个集合，通过选择适当的参数可使这个集合任意小。

The chance of the rope coming out of the krab on anchor placements is small unless you decide to do an Irish jig on the stance, especially when using a clove hitch that is pulled tight.

在放固定点的地方，绳子脱出钩环的机会很小，除非你决定要在那个位置做Irish jig，尤其是使用拉紧的双套结的时候。

Based on skeleton graphics, a handwritten Chinese character is defined as a set of isolated branch, isolated loop and component. Relation among these three elements is also defined, and then a mathematical model is raised.

针对小类别数手写汉字，在骨架图形的基础上，把手写汉字看作孤枝、孤环和部件的集合，并定义三者之间的方位关系，从而建立手写汉字的数学模型。

Check to make sure gauge line completely coincideut, red with black paper or manbrane will be exposure patterns and corresponds to the former Central lining white hair that fell outside note that the manbrane of black paper or red edge away from patterns as much as possible, as this will prevent dot narrow and hair.

查抄并不否认规线合座轻合后，用暗纸或赤膜片不兵给曝光的图案和差应于后环衬的空缺局部以内的不天方盖住（夺目暗纸或赤膜片即图案边际只管即便近一点，否则会使网点放不小且发虚。

Check to make sure gauge line completely coincideut, red with black paper or manbrane will be exposure patterns and corresponds to the former Central lining white hair that fell outside Note black paper or red manbrane from the pattern at the edge, as far as possible as this will prevent dot narrow and hair.

查抄并不否认规线合座轻合后，用暗纸或赤膜片不兵给曝平的图案和差应于后环衬的空缺局部以内的不天方盖住夺目暗纸或赤膜片即图案边际只管即便近一点，否则会使网点放不小且发虚。

How big a macrocycle should be for threading to occur is a basic and important question in threaded structure chemistry.

在互穿结构化学中，客体二级铵盐究竟最小能穿过多大的冠醚环的空腔形成互穿结构是一个基本但非常重要的问题。

By means of the study of three types of main-switch, it shows that the circuit inductance of the modified ring-small disk main-switch supported by parallel metal bars is feasible to achieve appropriate main current.

经过对三种主开关结构进行实验研究，结果表明：改进的并联金属棒支座圆环-小圆盘型主开关的导通电感比较合适，可产生较好的主脉冲电流。

The white arrow on the black card marks the site of a ruptured berry aneurysm in the circle of Willis.

在黑色卡片标出的白色箭头代表 Willis环上破裂的颅底小动脉瘤的部位。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。