【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。
【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 。
【判断题】若正四棱柱的底面为水平面,一个棱面为正平面,则其主视图为反映前后棱面实形的矩形线框。
【单选题】74 若正四棱柱的底面为水平面,一个棱面为正平面,则其主视图为________。
【单选题】听力原文:M: Molly gave Lily flowers yesterday. W: Molly just does it for Henry. M: Why did he give flowers? W: It's Lily's birthday yesterday. M: Are they on date? W: I'm not sure. Who gave Lily flowers?