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
A. 全民防御 B. 军民共同防御 C. 军队防御
A. 光电隔离 B. 电源隔离 C. 变压器隔离 D. 继电器隔离