在（），客户仍然没有还款，则应收账款为逾期应收账款。
A、赊销产品到货后
B、赊销产品离岸后
C、赊销合同到期后
D、赊销产品发货后
参考答案：C
根据句意及首字母提示完成句子。
1. —Where's your friend?
—She's sitting b______ here deskmate.
2. That musician has w______ many songs.
3. —Has your father been a______?
—Yes. He has been to many countries.
4. Zhang Ziyi is very famous. He Meifeng has always wanted to m______ her!
5. How many tickets can you buy if they are all s______ out?
如图所示,光滑水平面AB与竖直面内的半圆形导轨在B点相接,导轨半径为R.一个质量为m的物块(可视为质点)将弹簧压缩至A点后由静止释放,在弹力作用下物块获得某一向右速度后脱离弹簧,当它经过B点进入导轨瞬间对导轨的压力为其重力的7倍,之后向上运动恰能完成半个圆周运动到达C点.试求:
(1)弹簧开始时的弹性势能;
(2)物块从B点运动至C点克服阻力做的功;
(3)物块离开C点后落回水平面时的动能.
