300s

When the hold time is 300s , the impact toughness and the bonding strength are at the most .

保温时间300s时，冲击韧性和剪切强度均达到最大值。

Improvement in design of 300S & 250A pump

300S&250A型水泵的改进设计

The production rate of pyrolysis gas reduced from 300s at 450 ℃ to less than 75s at 850 ℃ .

热解温度升高产气析出速度加快，由450℃时的约300秒减小到850℃时的不到75秒；

It is shown that the temperature in the preheating zone should not be over 420 ℃ and particles retention time should be control in the range from 200s to 300s .

具体如下：预热带温度不应超过420℃；且颗粒在其中的停留时间控制在200～300s。

Methods Seventy four patients with exophthalmos were studied using Toshiba 300S CT apparatus , and the coronal and axial CT imaging of orbit with pre and post-contrast were taken .

方法采用东芝300S全身CT机，对74例患者进行眼眶轴位、冠位平扫及强化CT扫描。

A quarter area on each dentinal slices was irradiated under the laser with different laser power and with different time of irradiation ( 180s , 240s , 300s ) .

选用不同功率的激光照射牙本质片，每种功率激光分别照射180s、240s和300s。

Two-six needles were inserted into the splenic parenchyma sequentially and the microwave power was set at 60W 300s , 50W 360s and 40W 450s respectively .

微波消融的能量时间组合分别为60W300s，50W360s，40W450s。

The results showed that the LASER 300S ran well under the proper combination of parameters calculated from these equations , the actual values of CD were considerable stable and coincident with the calculated ones , and the on-line perforation quality was improved .

试验结果表明，利用各线性方程可计算出能保证LASER300S激光打孔系统正常运行的参数组合，与实际在线打孔的烟支稀释率值具有较好的符合性和稳定性，能够提高在线加工质量。