皮皮学，免费搜题
登录
搜题
【简答题】
已知⊙O，半径为6米，⊙O外一点P，到圆心O的距离为10米，作射线PM，PN，使PM经过圆心O，PN与⊙O相切，切点为H。 （1）根据上述条件，画出示意图； （2）求PH的长； （3）有两动点A，B，同时从点P出发，点A以5米/秒的速度沿射线PM方向运动，点B以4米/秒的速度沿射线PN方向运动，设运动的时间为t（秒）；当t为何值时，直线AB与⊙O相切？
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】阅读理解。 Mum gives little Tom ten yuan. Then little Tom goes shopping. He gets on the bus and sits down next to an old woman. Then he sees the old woman's handbag is open. There is ten yuan in it. He qui...
【单选题】【卡诺循环】如图表示的两个卡诺循环,第一个沿 ABCDA 进行,第二个沿 ABC'D'A 进行,这两个循环的效率 的关系及这两个循环所作的净功 W 1 和 W 2 的关系是
A.
W 1 = W 2
B.
W 1 = W 2
C.
W 1 > W 2
D.
W 1 < W 2
【单选题】_______with what little Tom said, the teacher decidedto take him as his new student.
A.
To satisfy
B.
Havingsatisfied
C.
Satisfied
D.
Satisfying
【单选题】Don't worry! Tom is busy (忙的) but he has time to finish it. [ ]
A.
a little / a little
B.
a little / a few
C.
little / little
D.
a few / little
【单选题】患者男性,79岁。因上厕所用力过猛,便后出现左下腹疼痛,查体:腹胀不对称,初步诊断为乙状结肠扭转。行下消化道气、钡双重造影,出现哪一种表现可明确诊断
A.
回盲部“杯口样”阴影
B.
巨大孤立肠襻阴影
C.
“鸟嘴样”阴影
D.
阶梯状排列气液平面
E.
膈下游离气体
【多选题】中国铁路上海局集团有限公司关于公布《中国铁路上海局集团有限公司重点旅客服务标准》的通知（上铁客〔2018〕243号）规定：重点旅客按其对服务的要求分为一般重点旅客和特殊重点旅客。下列不属于一般重点旅客的是（）。
A.
能自主旅行的重点旅客
B.
虽不能完全自主旅行、但有成年旅客同行，不需要站车提供特别帮助的重点旅客
C.
不能自主旅行的重点旅客
D.
虽有成年旅客同行，但同行人无法解决实际困难，而需要站车提供特别帮助的重点旅客
【单选题】As soon as little Tom had _______ a little from his shock, his first thought was to get away . [ ]
A.
returned
B.
benefited
C.
survived
D.
recovered
【单选题】As soon as little Tom had ________ a little from his operation at his back, his first thought was to get out to meet his friends.
A.
returned
B.
survived
C.
absorbed
D.
recovered
相关题目：