皮皮学,免费搜题
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皮皮学刷刷变学霸
举一反三
【判断题】使用“相等”约束两端圆弧后,两圆弧弧长相等。
A.
正确
B.
错误
【简答题】如图 所示,两串联双活塞杆液压缸的有效作用面积 A 1 =80cm 2 , A 2 =50cm 2 ,液压泵的流量 q p =3.2 *10 -3 m 3 /s ,负载 F1=5000N,F2=4000N ,不计损失,求两液压缸的工作压力及两活塞运动速度 ?
【单选题】( )是裴斯泰洛齐教学理论的核心,认为教育过程必须从一些最简单的因素开始,逐步提高儿童认知的水平。
A.
道德教育论
B.
自然教育论
C.
要素教育论
D.
活动教育论
【判断题】我国两弹一星指的是导弹、核弹、人造卫星
A.
正确
B.
错误
【单选题】德育必须从提高道德认知开始。( )
A.
正确
B.
错误
【简答题】如图3-2所示,两串联双活塞杆液压缸的有效作用面积A1=50cm2,A2=20cm2,液压泵的流量qp=0.05×10-3m3/s,负载W1=5000N,W2=4000N,不计损失求两缸工作压力P1、P2及两活塞运动速度v1、v2。
【判断题】德育工作必须从提高学生道德认知开始。
A.
正确
B.
错误
【多选题】组成中含有大黄、芒硝的方剂是( )
A.
小承气汤
B.
大承气汤
C.
调胃承气汤
D.
温脾汤
E.
黄龙汤
【单选题】当中年男性患者出现哪一项症状时应怀疑是鼻咽癌早期症状:( )
A.
原因不明的头痛与眼外肌麻痹
B.
鼻涕中带血
C.
颈部肿物
D.
一侧咽鼓管功能障碍
E.
有以上症状之一就应引起注意
【简答题】(10分)如图所示,两串联双出杆活塞式液压缸的有效作用面积 A 1 =10×10 -3 m 2 , A 2 =5×10 -3 m 2 ,液压泵的额定流量 q v 额 =0.2×10 - m 3 /s,不计损失,试计算: (1)缸1的活塞运动速度 v 1 为多少m/s?(2分) (2)缸2的活塞运动速度 v 2 为多少 m/s ?(2分) (3)当两缸负载相同,缸1的工作压力 p 1 =2MPa时,...
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