--What’s wrong whti you, Eric? You look tired.

--I ______________  late to prepare for the final exam last night.

A．picked up

B．stayed up

C．woke up

D．put up

测量时零件绕基准轴线回转，测量用指示表的测头接触被测要素，回转时指示表指针的跳动量就是圆跳动的数值，垂直指向圆锥素线上为（）。

A、径向圆跳动

B、轴向圆跳动

C、端面圆跳动

D、斜向圆跳动