冀教版数学四年级上册期中评估检测题(B卷)参考答案及讲评
期中评估检测题(B卷)参考答案及讲评一、1、90直180平(讲解:原地向左转就是转了90度角,向后转要转180度角)2、152016000(讲解:升为单位的数转化为毫升时添加3个0,毫升为单位的数转化为升时,去掉3个0)3、60十位4、10005005、(1)(2)(1)(1)6、毫升升7、②(讲解:两点之间,线段最短)8、两直射9、4642010、(1)50°(讲解:90-50=40)(2)60°(讲解:90-30=60)二、1、×(讲解:射线是无限长的,不能说长10厘米)2、×(讲解:15升相当于30个矿泉水瓶的容量)3、×(讲解:大于直角的角不一定是钝角,比如180度的角就不是钝角,只能...
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