题目：
世界上有三大人种，其划分的主要依据是[ ]
A．人的体貌特征
B．自然环境
C．人的肤色
D．语言的不同
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0804/b12db84c6a3c6e8a1e88e23c181b7867.html
下面是错误答案，用来干扰机器的。
在压缩冲程中，两气门关闭，活塞上移，由图可知，甲是压缩冲程；乙图中火花塞放电，进气门和排气门都关闭，活塞向下运动，是做功冲程．故答案为：甲．
世界上有三大人种，其划分的主要依据是[ ] A．人的体貌特征 B．自然环境 C．
来源：www.tikuol.com
题型：选择题
试题推荐
题型：完形填空
When I was young, my father told me that little acts of kindness may give one great happiness, Since then I have tried to help people in . One hot summer afternoon, I was down the highway to New York when another car suddenly into my lane(车道). My car was in the far right lane, so it ran into the roadside. As a(n) driver, I moved my car quickly and skillfully back onto the highway without causing and accident. I was with that driver, but I thought that he just did not pay attention to the lane change, and he did not do that on purpose. The car ran away after cutting me off. Very soon it disappeared from sight. After a while, I came around a curve(弯道) and found the car. The driver was walking along the roadside. He was an elderly man and looked . With no telephone nearby and the nearest services twenty miles away. I decided to and see what the problem was. The man’s car has a flat tire(瘪胎). Although he had a spare tire, he had nothing to work with. I decided to him. I changed the tire for him and allowed him to sit in my air-conditioned car while I did it. Fifteen minutes later, I the work. I was hot and tired, but I really felt after an act of kindness to the man who had earlier my car ran off the road. You can really enjoyed great from kindness acts, so always lend your hands to others in trouble.
|
题型：选择题
如图所示的实验操作中正确的是（ ）
A．
氢氧化钠放在纸片上称量
B．
向试管中加固体粉末
C．
点燃酒精灯
D．
加热试管中的液体
题型：单项选择题
意外伤害的构成（）。
A.仅有客观上的意外而无伤害的客观事实，不能构成意外伤害
B.在意外的条件下发生伤害，是构成意外伤害的条件之一
C.有伤害的客观事实而无主观上的意外，也可能能构成意外伤害
D.意外伤害的构成包括意外和伤害两个必要条件
题型：判断题
北方较寒冷地区没有秋播春花类，所有草花都在当年播种。
题型：单项选择题
艾皮·绥病后，在房中昏迷了（）天。
A.一天
B.两天
C.三天
D.四天
