皮皮学，免费搜题
登录
搜题
【单选题】
图示机构中半圆板A、B两点分别由铰链与两个等长的平行杆连接,平行杆O1A和O2B分别绕轴O1与O2以匀角速度w 转动,垂直上装一小滑轮C,滑轮紧靠半圆板,并沿半圆周作相对滑动,使在垂直滑道中上下平移。若以滑轮C为动点,以半圆板AB为动系,分析图示位置滑轮C的运动速度。以下所画的四个速度四边形中,正确的是( )A.
如图示 ；
B.
如图示 ；
C.
如图示 ；
D.
如图示 。
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
【单选题】Select the statement that you agree with the most
A.
The average citizen can have an influence in government decisions.
B.
This world is run by the few people in power, and there is not much the little guy can do about it.
【单选题】Select the statement that you agree with the most
A.
Many of the unhappy things in people's lives are partly due to bad luck.
B.
People's misfortunes result from the mistakes they make.
【单选题】患者,男性,58岁,近半年来额部及两颞部疼痛,用力时加重,晨起及傍晚时较重。常伴有恶心,有时呕吐。体检:神志清楚,视神经乳头边缘模糊,静脉充盈迂曲,视乳头隆起,肢体运动正常。为确定病变性质,可首选以下哪项检查:
A.
腰椎穿刺
B.
脑血管造影
C.
CT扫描
D.
脑电图检查
E.
颅骨X线摄片
【单选题】Select the statement that you agree with the most
A.
The idea that teachers are unfair to students is nonsense.
B.
Most students don't realize the extent to which their grades are influenced by accidental happenings.
【单选题】Select the statement that you agree with the most
A.
Who gets to be the boss often depends on who was lucky enough to be in the right place first.
B.
Getting people to do the right thing depends upon ability. Luck has little or nothing to do with it.
【单选题】Select the statement that you agree with the most
A.
In the long run people get the respect they deserve in this world
B.
Unfortunately, an individual's worth often passes unrecognized no matter how hard he tries
相关题目：