【单选题】人们常在高速公路路边种植黄山栾树,是利用了它的()的特性。
【单选题】What is the function of the thrust bearing?
A.
Prevents lateral movement of the slow speed gear
B.
Transmits propeller thrust to the hull
C.
Keeps spring bearings in line
D.
Prevents main reduction gear axial movement
【简答题】已知圆的方程为 (1)求圆心C的坐标和圆的半径r (2)判断点A(1,2),B(4,6),D(5,2)与该圆的位置关系。
【单选题】第一章10.旅游活动新六要素中的“奇”指的是()
【单选题】What is the function of the thrust bearing?
A.
Prevents lateral(横向的)movement of the slow speed gear.
B.
Transmits propeller thrust to the hull.
C.
Keeps spring beatings in line.
D.
Prevents main reduction gear axial movement.
【单选题】A thrust bearing is used with a propulsion diesel engine to ____.
A.
control axial movement of the crankshaft
B.
transmit engine thrust to the propeller shaft
C.
absorb vibrations in the propeller shafting
D.
prevent propeller thrust from being transmitted to the hull
【简答题】曲轴止推轴承 crankshaft thrust bearing
【简答题】已知椭圆 的离心率为 ,以原点为圆心,椭圆短半轴长为半径的圆与直线 相切. (1)求椭圆 的标准方程; (2)过右焦点 作斜率为 的直线 交曲线 于 、 两点,且 ,又点 关于原点 的对称点为点 ,试问 、 、 、 四点是否共圆?若共圆,求出圆心坐标和半径;若不共圆,请说明理由.
【简答题】crankshaft thrust bearing