Key type drill chuck, which is widely used in various minal and fixing enterprises, is a kind of drilltightening device.

Based on the idea of the structure parametric design method, the parametric finite element model of drill chuck with complicated spiral surface character was established.

采用结构参数化设计方法建立了含有复杂螺旋曲面特征的钻夹头参数化有限元模型；

An Approach to the Cost Reduction of the Materials of the Key Type Drill Chuck by Using the Theory of Value Engineering

运用价值工程原理降低扳手钻夹头材料成本的探讨

Analysis and Investigation on the Centering Precision of Drill Chuck

钻夹头定心精度分析与研究

Key type drill chuck

GB/T6087-1993扳手钻夹头

Simulation Method Based on Manufacturing Characteristics and Analysis of Output Character of Drill Chuck

基于制造特性的仿真方法及钻夹头输出特性分析

The hand-operated multifunction electric tool is characterized in that the small and special electric machine can be connected with the drill chuck by hand to form the hand-operated electric drill.

其特征在于微特电机可以人为与钻夹头连接，便组成了手持式电钻；

The goal of this research was threefold: using Tr ü ck et al. ( 2006)' s results and methodology, we first investigated the changing market dynamics through the study of the futures and volatility term structures of EUA and found a market in clear contango.

本论文的目标有三层：第一，利用Trück et al.的结果和方法，通过对欧盟排放配额期货和波动的期限结构的分析来研究变化的市场动力，发现了市场明显地处于期货升水。

Second, we provided an empirical analysis of the EUA convenience yield in the EU ETS and studied its dependence on factors such as the spot price level and volatility.

第二，我们通过对欧盟排放配额便利收益的实证分析，发现现金价格和波动率是其重要的影响因素。

Both papers study the convenience yield of EUA futures using data available during the first phase of the EU ETS.

两篇文章利用EU ETS第一阶段的数据来分析欧盟排放配额期货的便利收益。

Crude oil, natural gas and coal also affect EUA price.

EUA价格也受原油、天然气和煤炭等能源价格影响。

He is as busy as a bee trying to put the house in order.

他为了要把家里弄得整整齐齐，忙了好一阵子。

But we have also heard the saying "as busy as a bee." Some bees will work only several hours, while some will work over 12.

有句英国谚语叫“像蜜蜂一样忙碌”，有的蜜蜂一天只要工作几小时，而有的竟然要工作超过12小时。

Busy as a bee, you always have a project in the works!

像蜜蜂一样忙碌的你总是在进行着一个项目！

She never seems to have time to talk. She's always busy as a bee.

她是个大忙人，好像总是没有时间说句话。

Kathy never has time to be bored. she's as busy as a bee from morning to night.

凯西从没有时间烦恼。她从早到晚像蜜蜂一样忙个不停。

Mum is always as busy as a bee in the morning.

妈妈每天早上都忙得不可开交。

Don't bother Mr.B; he is always as busy as a bee.

别打扰B先生；他老像蜜蜂般忙个不停。

My mother is always as busy as a bee.

我妈妈总是很忙。她总是像蜜蜂一样忙碌。

My wife never has time to get bored. She's as busy as a bee from morning to night.

我妻子从来不感到厌烦。她总是从早到晚像蜜蜂一样忙碌着。

He is as busy as a bee once in a while.

他有时也像蜜蜂一样忙碌。