皮皮学，免费搜题
登录
搜题
【单选题】
距离太阳系最近的恒星是半人马星座 a 星,它距地球约 4.5 光年.若宇宙飞船相对于地球的速度为 v =0. 866 c ( c 表示真空中的光速 ) ,要自地球飞到半人马星座 a 星,按地球上的时钟计算 , 需要 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 年 .A.
2.6
B.
5.2
C.
7.8
D.
10.4
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】Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and wheth...
A.
You can go and get help from the specialists.
B.
You can depend on common sense when choosing a dog.
C.
You should decide what kind of dog you want.
D.
You should consider the size of the dogs.
【单选题】Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and wheth...
A.
You can always get help from the specialists.
B.
It is common sense that is the most important when choosing a dog.
C.
You should decide what kind of dog you want.
D.
Size and characteristics of the dogs should be considered too.
【简答题】B Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and whe...
【单选题】At some time in your life you may have a strong desire to do something strange or terrible. However, chances are that you don't act on your impulse, but let it pass instead. You know that to commit th...
A.
a crime committed on impulse
B.
an unfavorable impression left on other people
C.
a behavior. considered unacceptable by the public
D.
a strong desire to do something strange or terrible
【单选题】At some time in your life you may have a strong desire to do something strange or terrible. However, chances are that you don't act on your impulse, but let it pass instead. You know that to commit th...
A.
a strong desire to do something strange or terrible
B.
a crime committed on impulse
C.
behavior. considered unacceptable in society's eyes
D.
an unfavorable impression left on other people
【简答题】Passage Two Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you ne...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
