【简答题】Take a map with you. You might get lost in the mountains.
【判断题】多缝干涉已知缝数为N,则在相邻两最大光强之间会出现N-1个极小值
【判断题】多缝干涉已知缝数为N,则在相邻两最大光强之间会出现N-1个次最大
【单选题】No discount will be granted ____ you place an order for more than 1000 tons.
【判断题】指令DoWait是用来等待一个输出信号的值
【单选题】You will get lost easily you take a map of the city with you. A. until B. unless C. although D. if