【判断题】质点系的质心运动状态完全取决于该质点系所受的外力,内力不能使质心产生加速度。
【单选题】要细调白平衡,把摄像机白平衡开关拨到A档,接下来按下什么按钮开始进行白平衡调整?【图片】
【单选题】My father always warns me that there is no such thing as a free lunch because we can’t get _________ for nothing.
【单选题】I can't get my boots_____They are too tight.
【判断题】质点系的质心运动完全取决于该质点系所受的外力,与内力作用无关。
【单选题】要细调白平衡,把摄像机白平衡开关拨到A档,接下来按下什么按钮开始进行白平衡调整?
【单选题】As a teacher, I can’t have my students ____________lying.
【单选题】My mother can't _________ because she has rheumatism.