而曲轴,在齿轮箱挂挡时, 又使汽车持续运动.When the gears are engaged, the crankshaft keeps the car moving.但是风力发电机的齿轮箱存在着经常在刹车时受冲击载荷而过早损坏的问题.The gear box of wind - driven generator is premature damage by impact load.对于电机操作机构,齿轮箱配置标准安装法兰.For ...
全国各地牧场对套种谷物的选择都不相同.Farmers'preferences for a companion cereal vary over the length and breadth of the country.由单一种植向间作套种的立体农业转移.By onefold cultivate the stereo agriculture move to intercropping interplanting.果园内实施多熟...
The arteries are diseased and a transplant is the only hope...动脉已经发生病变，移植是唯一的希望。Even grafting new blood vessels in place of the diseased coronary arteries has been tried.甚至移植新血管代替不健康的冠状动脉的方法都已经试过.Objective To explore the...