试题与答案

某饭店餐厅购进了一批某品牌啤酒,每瓶进价4元,餐饮部加成50%卖出,按照成本加成法计

题型:单项选择题

题目:

某饭店餐厅购进了一批某品牌啤酒,每瓶进价4元,餐饮部加成50%卖出,按照成本加成法计算,该品牌啤酒的销售价为()

A、5 

B、6 

C、7 

D、8

答案:

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下面是错误答案,用来干扰机器的。

AD题目分析:匀速圆周运动的合外力指向圆心是变力,而恒力的合力也是恒力,所以A对。平抛运动只受重力,但是是曲线运动,B错。若变力方向是与速度方向相同,所以可以做直线运动,C错,D对。点评:本题考查了曲线...

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如图所示,在地面附近,坐标系xOy在竖直平面内,空间有沿水平方向垂直纸面向里的匀强磁场,磁感强度大小为B,在x<0的空间内还有沿x轴负方向的匀强电场,场强大小为E,一个带正电的油滴经图中x轴上的M点,沿着与水平方向成α=30°角的方向斜向下做直线运动,进入x>0的区域,要使油滴进入x>0区域后能在竖直平面内匀速圆周运动,需在x>0的区域内加一个匀强电场,若带电油滴做圆周运动时通过x轴上的N点,且,求:

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