摘要:
Tray usually refers to a JEDEC standard matrix tray measuring 12.7x5.35 inches and either 0.25 or 0.40 inches tall. Trays are usually constructed from 阅读全文
摘要:
Kettles Stop Whistling in the Dark British physicist Lord Rayleigh is best known for his discovery of argon and for explaining, in 1871, why the sky i 阅读全文