【判断题】MC、MCR指令的操作元件为Y、M,但不允许使用特殊辅助继电器M。
【简答题】Many years ago,there was a girl. Her name is Molly. One day, Molly went into the forest. She saw some big trees and picked some flowers. Soon she was lost. 小题1: She saw a little house. She ran to the...
【判断题】MC、MCR指令的操作元件为Y、M,但不允许使用特殊辅助继电器M。
【判断题】“末日危途”主题科幻小说将“灾变”设定为故事发展的背景之一,现实生活中,人们通常把PH值小于5.6的降水称为酸雨。
【简答题】空气中的CO 2 使降水有一定的酸度。根据干空气中CO 2 的含量,计算得到在一定温度和水蒸气压时CO 2 在水中的溶解度为1.03×10 -5 mol·dm -3 ,求此状态下自然降水的pH背景值。已知碳酸的K 1 =4.2×10 -7 ,K 2 =5.6×10 -11 。
【简答题】Molly was a peasant girl. Her parents did not have much money and Molly did not have many nice clothes. One day Molly’s father said to her, “Molly, take this pot of milk to market and sell it. You may...