牵引

Methods Twelve cases of anterior crossbite and crowded dentition (with 6~12 mm) were included using extroral arch and extroral protraction in the same time or in the different time.

选择混合牙列期或恒牙早期有前牙反并牙列拥挤（拥挤度6~12 mm）病例12例，同时或先后使用前方牵引装置和口外弓装置，观察疗效。

Despite it was considered as a tractor at first, it became one of the world's first tank destroyers.

尽管最初打算是用在牵引车上，它成为了世界上最早的坦克歼击车之一。

Specifically formulated for use in draglines, shovels, and excavators.

因此，特别适用于牵引绳索、电铲和挖掘机的润滑。

Specifically formulate d for use in draglines, shovels, and excavators.

因此，特别适用于牵引绳索、电铲和挖掘机的润滑。

And traction control will be again be outlawed altogether from the start of the 2008 season, when the introduction of standardised ECUs to the cars will make policing the ban far easier than in the past.

和牵引控制系统，将再次被取缔，从一开始的2008赛季，当引入标准化，以欧洲货币单位的小汽车将作出治安禁令容易得多，高于过去。

After a long period during which traction control was banned, the FIA decided to re-allow its use at the start of the 2002 season as it was becoming increasingly difficult to prove that ECUs were not being used to replicate traction control functions.

经过漫长的时期，其中牵引控制系统被取缔后，国际汽联决定重新允许其使用，在开始的2002赛季，因为它正在变得越来越困难，以证明欧洲货币单位，不被用来复制牵引力控制系统职能。

Foam put on with the elastics holding it in place.

泡沫提出的关于与牵引控股它在的地方。

Plowing the rice fields Water buffalos are good at moving around in the swampy and muddy areas where, for example, rice grows. So water buffalos are used to plow the rice fi elds.

我们利用牛的强壮，让它从事牵引工作、负重工作，在水田中拉犁，在泥沼里行走，没有比水牛更合适的动物了。

Space vector pulse-width modulation control strategies were proposed for three level inverters of traction drives in high-speed EMUs.

提出了适用于高速动车组牵引传动中三电平逆变器控制的空间矢量脉宽调制控制策略。

Maybe it's the extreme heat, but our summertime speculation makes us wonder if GM and Allison are planning to add extra gears to the current 6-speed Silverado for improved fuel economy and towing efficiency: Could we see the Allison transmission get 8 cogs, like some luxury cars already have?

也许是极热，但我们的夏季投机，使我们想知道通用汽车公司和Allison正计划添加额外的齿轮目前的6速西维拉多改善燃油经济性和牵引效率：我们可以看到艾利森获得8齿轮传动，像一些豪华轿车已经有？

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。