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【单选题】
ZigBee 无线传感器网络中负责网络建立与管理的功能部件是( )。A.
ZigBee 路由器
B.
ZigBee 协调器
C.
ZigBee 终端设备
D.
ZigBee 控制器
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举一反三
【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
【单选题】Where will the thrust forces from the propeller be transferred to though a thrust bearing?
A.
The hull of the ship.
B.
The engine.
C.
The gearbox.
D.
The crankshaft
【单选题】Where will the thrust forces from the propeller be transferred to through a thrust bearing?
A.
The hull of the ship.
B.
The engine
C.
The gearbox
D.
The cranks
【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】crankshaft thrust bearing
【简答题】thrust bearing
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