保护遗址、栖息地和风景区是重中之重。Protection of sites, habitats and landscapes is of uppermost priority.设得兰群岛是水獭在不列颠群岛上最后的栖息地。Shetland is the last stronghold of otters in the British Isles.乌干达美丽的高地是众多野生动物的栖息地。Uganda's beautiful hig...
表面贴装开关二极管. 75五,反向电压整流电流250毫安.Surface mount switching diode . Reverse voltage 75 V. Rectified current 250 mA.目前沉船的NPN开路集电极晶体管, 单通道二五〇毫安最高.Current sinking NPN open collector Transistor, Single channel, 250 mA max.低内阻原理也同样适...