皮皮学，免费搜题
登录
搜题
【单选题】
已知Ω={（x，y）|0≤x≤1，0≤y≤1}，A是由直线y=0，x=a（0＜a≤1）和曲线y=x 3 围成的三角形的平面区域，若向区域Ω上随机投一点P，点P落在区域A内的概率是 1 64 ，则a的值为（ ）A.
1 64
B.
1 8
C.
1 4
D.
1 2
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】哪种寄生虫感染宿主后,宿主既是它的中间宿主、又是它的终末宿主。先为终末宿主,后为中间宿主。A. 旋毛虫 B. 日本血吸虫 C. 弓形虫 D. 华枝睾吸虫
【简答题】以下哪些内容需要包含在研究实施方案中A. 抽样实施B. 问卷编写C. 调查执行D. 分析方法E. 质量评估
【简答题】Have you know Paula _____ last summer?
【单选题】Peter Paul
A.
Overfishing results from extensive use of new technologies．
B.
Many people in my place support stricter regulation on fishing．
C.
I think that you failed to point out the real reason for overfishing．
D.
We are in a very weak position to compete with other countdes in fishing．
E.
Sooner or later，we will feel regretful about out current fishing practice．
F.
I didn’t know there were such damaging ways of fishing around the world．
G.
I wonder if those fishermen have ever considered the consequences of exhausting ocean resources．