本文引入直投射覆盖的概念，证明了环R为左完全环当且仅当每一个左R-模（平坦左R-模）具有直投射覆盖；
This peper introduces the concept of direct-projective covers, and prove that a ring R is left perfect if and only if every left R-module(flat left R-module) has a direct-projective cover;
当然，那将是小丑，一个恶魔般的三环马戏团人物，被希斯·莱杰完全地发挥出来。
That would be the Joker, of course, a demonic creation and the three-ring circus of one wholly inhabited by Heath Ledger.
有一位环保主义者认为，大楼如此之高，将会危及喜欢夜间迁徙的鸟类安全，因为飞鸟完全可能“砰”地一声撞在冷不丁出现的障碍物上。
Such tall buildings, a conservationist there protested, would interfere with the night migration of birds, which would bang into the unexpected obstructions.
中型钢琴完全铸铁板和非常严格环了许多层次的硬木。
Medium size grand piano with complete cast iron plate and very rigid rim made by many layers of hardwood.
示指、中指和环指是最常累及的手指，而拇指常完全不受累。
The index, middle, and ring finger are the most frequently involved digits, while the thumb is often spared entirely.
其他混凝土楼板也完全使用了零V OC环氧粘合剂。
Elsewhere, the concrete floor was simply sealed with zero-VOC epoxy.
或者，你可以完全的避开喉环，仅仅把链子收紧，然后把牵引索扣在上面。
Or you can bypass the throat ring altogether and fasten the nose chain to itself and snap the lead rope to it.
本文提出了多环空间连杆机构摆动力完全平衡的单位向量法。
This article presents the unit vector method for the full shaking force balancing of multi-loop spatial linkages.
运用磁场的叠加原理及第二类完全椭圆积分，给出了椭圆形稳定电流环垂直轴上的磁感应强度。
According to the superposition principle and the second kind of complete ellipse integral, the magnetic field current circle was calculated.
高度完全关闭闸阀可以用在热水龙头，或拆卸阀座环安装吊耳后，用在采用软铁块的管路中。
Height completely closed valve can be used in hot water taps, installing or removing the seat ring lug, the use of soft iron in the pipeline.
奇怪且缺少焦点。奥运五环变成了鹰和铃铛的附属。奥运精神完全缺席。
Strange and lacking focus. The Olympic rings become subordinated to the eagle and bell forms. The spirit of the Olympics is totally absent.
但带涤纶连接环记忆合金组合式人工食管还存在中晚期脱管的问题未能完全解决。
However, trachea cannula exodus of terylene tandem ring alloy composite artificial esophagus in middle and late phases cannot be fully solved.
结论：LC - 1型骨盆环骨折代表了一大类骨盆损伤类型，其中大部分骶骨完全骨折。
Conclusions: LC-1 fractures of the pelvic ring represent a spectrum of injuries, with a large proportion having complete disruption of the sacrum.
其表现为：1、熔结环氧粉末（FBE）层偏薄，不能完全覆盖管道金属表面。
The non-conformities are as follows: 1, the thickness of FBElayer is thin, the FBE coating material can not cover the steel surface entirely.
通过显微镜可以观察到：环锭纱的结构与转杯纱完全不同。
It can be seen at a glance through the microscope; the structure of ring yarns is completely different from that of rotor yarns.
由准同步视频检波的特点及其存在的问题引出锁相环（ PLL）完全同步视频检波电路。
The PLL full synchronization video detector circuit is educed by feature and troubles of quasi-synchronization video detector.
你可以在组织的带领下去寻找，要么就完全碰碰运气，找到那个拴在门上或是灯柱上的稻草环，那么热情的主人就在等着你来品尝美酒了。
You can visit them with a group and guide, or else simply surrender to serendipity and hunt for the straw wreaths that hang from a door top or lamppost, a signal that hospitality awaits.
在优化条件下，a-蒎烯的转化接近完全，产物中2，3-环氧蒎烷的含量可达96％，其选择性为98％。
Under optimum conditions, the conversion ofa-pinene was almost complete, yield of 2,3-epoxypinane was 96%and the selectivity was 98%.
第一章中，我们研究了剩余域是代数闭域的离散赋值环上的完全分次代数；
In the first chapter, we discuss the fully graded algebras over discrete valuation ring with an algebraically closed residue field of characteristic p.
刚开始，你会看到发动机冒黑烟，这很正常，是因为密封环还没有完全密封的缘故。
You'll notice that at first the engine "smokes" on decel, this is normal, as the rings haven't sealed yet.
非环氧砂浆可能有另外要求的表面准备。环氧砂浆的完全结合强度通常是不必要的。
Grouts other than epoxy may require alternative surface preparation. Full bond-strength of epoxy is not generally necessary.
但是旋风除尘器中存在的短路流，上灰环，二次扬尘等现象，使得固体颗粒不能被完全有效分离，降低了除尘器的分离效率。
But such as short circuit flow, up ash loop, re-entrainment exists and so on phenomenon, made the solid particle couldn't be separated efficiently, so reduced separation efficiency of the cyclone.
虽然不能完全消除病毒，但二甲胺四环素为科学家们指明了一条方向，即寻找更多作用等同于二甲胺四环素的药剂。
Although we can not completely eliminate the virus, but minocycline for scientists pointed out a direction, that is equivalent to looking for more role of the pharmaceutical minocycline.
利用PLC高速计数模块直接将外部编码器发出的脉冲读入，在PLC内部编程，通过程序控制完全能取代位置控制器的所有功能，从而省出位置控制器这一环节。
The pulse is directly read out by utilizing PLC high-speed counting module, the function of the locating controller can be achieved by program, thus the locating controller are saved.
同时，讨论了一类M -完全正则半环的坚固构架结构。
At the same time, we investigate the sturdy frames of M-completely regular semirings.
围绕套管的四周360度的环型空间允许水泥完全能够密封套管与井壁。
A continuous 360-degree annular space around casing allows cement to completely seal the casing to the borehole wall.
沥青是一种高粘度、黑色、粘稠混合的有机液体，完全溶于二硫化碳和主要是高度浓缩多环芳烃组成。
Bitumen is a kind of black, thick viscous and blend organic liquid, completely melt in carbon disulfide, mainly organized by high enriched PAH.
环签名作为一种签名者完全匿名技术得到了广泛的应用。
As a technology which endows the signers with anonymity, ring signature has been widely used.
多环芳烃是一组化学物质，他们是由未经完全燃烧的煤。油和气。垃圾。或是其它有机物质形成的。
PAHs are a group of chemicals that are formed the incomplete burning of coal, oil and gas, garbage, or other organic substances.
完全符合芬兰M1环保认证，具有M1认证的产品挥发出的气味相当于玻璃级。
Environmental certification in full compliance with the Finnish M1, M1 certified products with the smell of volatilized level equivalent to the glass.
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