难控制的

But some of those systems adopt one layer DDC structure that is unreliable and badly expansible, and can't satisfy the requirement of general management and hierarchy management in fermentation process.

但在这些实现的系统中，有很大一部分采取单级的直接数字控制系统结构，可靠性和可扩展性都比较差，很难满足对全厂的发酵过程进行全局管理和分级管理的需要。

In practical engineering, it is difficult to find out the minimal surface meeting the architecture demands and the boundary restrictions, hence, the difference in the stress distribution should be controlled in a special range.

在实际工程中，由于膜结构建筑要求和边界条件的限制，找到具有极小曲面性质的初始平衡形状较难。因此，一般把应力的差值控制在一定的范围内。

Tuning the three parameters K_p, K_i and K_d on line. Some control difficulties due to the nonlinearity and model uncertainty of BLDC motorize recovered effectively. Tune the three parameters of PID controller to ameliorate the performance of control system.

对PID控制器的三个参数K_p，K_i和K_d进行在线调整，有效地克服了由无刷直流电机的非线性、参数时变性、模型不确定性等引起的控制难的问题。

It is very difficult to realize high precision of rolling mill's calculation of the traditional mathematical model.

带钢热连轧宽度控制过程是一个复杂的非线性过程、难以建立精确的数学模型，对于传统的数学模型的轧机计算很难实现精度要求。

TCP rate control algorithms based on window and its variant algorithms are widely used in Internet as a standard. The complex applications need to QoS is difficult to meet, completely depending on policies and algorithms in the terminal.

基于窗口的TCP速率控制及其改进算法，虽然已作为标准在Internet上广泛使用，但是完全依赖于终端系统的策略和算法是很难满足复杂的应用对QoS的需要。

So long as your computer to do the basic security configuration, it is difficult to hackers through 4899 to control you.

所以只要你的电脑做了基本的安全配置，骇客是很难通过4899来控制你的。

Refractory hypertension is a progressive process from mild hypertension to moderate, severe hypertension due to absence or inadequate treatment in patients with hypertension.

难治性高血压是指高血压病人经过足够剂量和合理的三种降压药联合治疗，包括利尿剂，三种药物均已用到几乎最大剂量，血压仍不能降到140/90mmHg以下；对于单纯收缩期高血压的老年人在类似的处理后，收缩压不能控制在160mmHg以下[1]。

At this period, the gram 威 gram still witnessed an ugly election of the small towns, controling two party groupings of this small town mutual 诘 to be difficult and make to forge falsely for the sake of the election.

在这期间，匹克威克还目睹了小镇的一场丑陋的选举，控制这一小镇的两个党派为了选举互相诘难、弄虚作假。

Passive cooling system is composed of multiple sets of fans, which can remove the heat of LED beads adequately even in high room temperature conditions. Besides, KEY's tooth optical cooling technology, completely solved the high-power LED thermal problems.

目前大功率芯片以1W~3W为主。5W以上的单颗LED全由1W或3W合成，能合成10~50W的单颗灯珠，但其需要超大型散热器加风扇来减少光衰，但散热和光衰还是难以控制，可能在3-5年内也难在技术上解决合成灯珠发热太高的问题。

Controlling the spin is the hardest part of knife throwing, at least for mere mortals like me.

控制飞刀的旋转是飞刀技术中最难的部分，至少对于我这样的凡人是如此。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。