必需的

The Model 2800 pneumatic plunger regulator is recommended for use in a variety of applications where mechanical actuation is required, including control stations and test panels, and in construction machinery and industrial or oil rig control equipment.

示范2800气动活塞调节，建议为在使用各种应用在机械驱动是必需的，包括控制站和测试面板，并在工程机械和工业或石油钻井平台的控制设备。

To create the olive, king of all trees, a hundred years is required.

要创建橄榄油，国王的所有树木，百年是必需的。

The influence of some factors on clinkering range is discussed and put in the order by means of the statistic method.

特别是运用二次回归正交试验法建立了能够计算和设计某一物料的烧成范围所必需的二次回归方程。

Its protein product was a membrain - associatedprotein, responsible for the transport of small molecules involving in osmoregulation.

在完全培养基R2YE上， scrC 是气生菌丝形成所必需的， scrC 的突变导致光秃表型；而同时放线紫红素超量表达。

This is somewhat difficult given the multiplicity of outline font formats, the lack of high-quality Type1 rasterizers and the additional rendering infrastructure required.

实现难点是：轮廓字体格式的多样性，缺乏高质量Type1光栅（译者：光栅用于光栅化字体）和必需的渲染架构。

Proper insertion and maintenance of the intravenous catheter are essential for the safety and success of parenteral nutrition.

静脉导管的正确插入和维护是保证肠外营养安全险和治疗成功所必需的。

Some form of patching or updating the system is always necessary.

对系统的一些形式修补或更新总是很必需的。

And, mtp1 is dispensable for pathogenicity of M. grisea.

它对于稻瘟病菌的致病性是非必需的。

This is necessary as the map carvers pave the way for the rest of humanity to follow.?

这是必需的，因为地图路径切割者们是在为其余的人类铺路以便于他们跟随。

In order to have time to peg and locate the extensions of the deposit, secrecy was necessary.

为了标记和定位这些矿脉的范围，保密是必需的。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。