A、p0 = p1;
B、p1 = p2;
C、p2 = p4;
D、p2 = (ClassC)p1;
E、p1 = (ClassB)p3;
F、p2 = (ClassC)p4;
更多“ Given:<br /> <img src="https://nimg.ppkao.com/2018-08/longzhengxuan/201808020849368993.jpg?sign=24a0d6f397c57242c37d74191279bede&t=62d086a2" /><br /> <img src="https://nimg.ppkao.com/2018-08/longzhengxuan/2018080208494692907.jpg?sign=893a0f96d7f374847534ebbc83311a07&t=62d086a2" /><br /> Which three are valid?（）”相关的问题
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A、如图所示的关系R和S，计算：R1=R-S、R2=R∪S、R3=R∩S、R4=R×S。<br /> <img src="https://img.ppkao.com/2019-04/tangxixi/2019041908441976394.jpg" /><img src="https://img.ppkao.com/2019-04/tangxixi/2019041908442583053.jpg" />
A、A.<img src="https://img.ppkao.com/2019-04/tangxixi/2019041215575492782.jpg" /><br /> B.<img src="https://img.ppkao.com/2019-04/tangxixi/2019041215575986570.jpg" /><br /> C.<img src="https://img.ppkao.com/2019-04/tangxixi/2019041215580850575.jpg" /><br /> D.<img src="https://img.ppkao.com/2019-04/tangxixi/2019041215581577569.jpg" />
A、A.<img src="https://img.ppkao.com/2019-04/wangjue/2019042816230963090.jpg" /><br /> B.<img src="https://img.ppkao.com/2019-04/wangjue/201904281623119775.jpg" /><br /> C.<img src="https://img.ppkao.com/2019-04/wangjue/2019042816231473858.jpg" /><br /> D.<img src="https://img.ppkao.com/2019-04/wangjue/201904281623172810.jpg" />
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A、A.<img src="https://img.ppkao.com/2018-08/wenxueying/2018080114295971472.png" /><br /> B.<img src="https://img.ppkao.com/2018-08/wenxueying/2018080114300659438.png" /><br /> C.<img src="https://img.ppkao.com/2018-08/wenxueying/2018080114301390095.png" /><br /> D.<img src="https://img.ppkao.com/2018-08/wenxueying/2018080114301865887.png" />
A、下图为CA6140型卧式车床传动系统图：<br /> <img src="https://img.ppkao.com/2019-04/leiyawen/2019041015355681589.jpg" /><br /> （1）试写出车削导程S=3mm时的车螺纹传动路线表达式。<br /> （2）根据车刀的用途可分为哪7种？
A、A.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715094615949.jpg" /><br /> B.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715095199276.jpg" /><br /> C.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715095581120.jpg" /><br /> D.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715095870672.jpg" />
A、一质点在xOy面上运动，运动方程为<br /> <img src="https://img.ppkao.com/2019-04/liyunao/2019041515083897769.jpg" /><br /> 式中t以s计x，y以m计．
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