电源接线盒应符合以下要求：输入电源电压范围为70 - 140V；输出功率为25VA，输出电压为48V±2V，且纹波电压不大于150mV（峰 - 峰值）。
Benjamin Franklin, a famous American diplomat, writer and scientist, died in 1790, but his proverb “Time is money” is taken more seriously by Americans of today than ever before. A study of proverbs from around the world shows that some values are shared by many cultures. In many cases ...
As far back as the 1790s, the elderly at a senior citizens’ home in England 21___ (encourage) to spend time with farm animals. This would help patients’ mental state more than the cruel therapies 22___ (use) on the mentally ill at the time. In recent years, scientists have finall...
1787.familiar 熟悉的1788.pretend假装1789.amaze使惊奇 1790.suffer容忍;受痛苦 1791.flood洪水1792.devotion奉献1793.wedding婚礼 1812.arrangement安排1813.pour倾;倒1814.angry 生气的1815.spokesman 发言人1816.lonely 孤独的1817.academy学会 1818.length长度 1819.thick 厚的;茂密的3395 1820.plenty大量1821.fair ...