多项选择题 下面功能中可以调整图像的亮度的是(      )。

判断题 大众汽车公司是欧洲最大的汽车公司,创建于1938年,费迪南德·保时捷是主要创建人.正确错误

单项选择题 Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the following statements is not true concerning this object? A、If the angular speed is constant, the object must have constant tangential speed. B、If the angular speed is constant, the object is not accelerated. C、The object has a tangential acceleration only if the disk has an angular acceleration. D、 If the disk has an angular acceleration, the object has both a centripetal acceleration and a tangential acceleration.