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...
这些小山碧绿陡峭，矗立在这条宽阔的河流之上。The hills rise green and sheer above the broad river.山谷上方的小山全是光秃秃的石头。The hills above the valley are bare rock.建在小山顶上的乌尔比诺镇the hilltop town of Urbino...
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...