【单选题】During working, when the piston is near the _____, the air ignites the fine spray of fuel.
【简答题】Although many of us may feel air-conditioners bring relief from hot, humid or polluted outside air, they pose many potential health hazards. Much research has looked at how the movement of air inside ...
【简答题】某种牵牛花清晨是粉红色,下午却变为蓝紫色.这是由于牵牛花中含有一种遇酸变红,遇碱变蓝的色素.牵牛花清晨呈粉红色是因为经过一夜的呼吸作用,细胞内的______含量增高,细胞液呈酸性;白天则由于______作用,细胞内CO 2 含量降低,花由粉红色逐渐变成蓝紫色.该色素的这种性质与实验室中常用的指示剂______性质相似.
【判断题】现代信号检测技术可以根据被试判断的结果将其分辨能力与参与实验的态度分离出来,从而降低实验误差。