皮皮学，免费搜题
登录
搜题
【简答题】
设在一条公路上有4辆汽车，分别以30km/h、40km/h、50km/h、60km/h的速度，通过路程长20km的路段，试求该公路上的时间平均车速和区间平均车速，并比较分析两种速度的大小和关系。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】23岁的汉族姑娘王燕娜为身患晚期尿毒症的18岁维吾尔族学生毛兰江无偿捐肾;白克日•卡依尔为救落水的汉族儿童纵身跳进湍急的水流中,献出宝贵生命;阿布力孜•努来克真情收养汉族弃婴......类似这样血浓于水的民族关系的感人故事还有许多。这充分表明:
A.
我国各民族之间实现了完全平等
B.
中国自古就是统一的多民族国家
C.
我国各民族已实现了共同繁荣
D.
我国各民族建立了平等团结互助和谐的新型民族关系
【单选题】Generally, mechanical system refers to( )
A.
mechanical transmission system
B.
mechanical actuator
C.
machinery and working process
D.
mechanical components and tools
【简答题】机械安全(mechanical security)
【简答题】机械性消化(mechanical digestion)
【单选题】Generally, mechanical system refers to( )
A.
mechanical transmission system
B.
mechanical actuator
C.
machinery and working process
D.
mechanical components and tools
【单选题】Why does the professor mention 'mechanical engineering'?
A.
To show that words in mechanical engineering are more specialized and more difficult.
B.
To show that words in some major fields are more difficult to learn than the words used daily.
C.
To show that different learning purposes result in different vocabulary learning strategies.
D.
To show that only people in mechanical engineering need to learn vocabulary in this field.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
