A、Compilation fails.
B、An exception is thrown at runtime.
C、An instance of Forest is serialized.
D、An instance of Forest and an instance of Tree are both serialized.
更多“ Given：<br /> <img src="https://nimg.ppkao.com/2018-08/wenxueying/2018080114121397.png?sign=952a2c1702288a79aa991e4da0ef86e3&t=62d69c8d" /><br /> What is the result？（）”相关的问题
A、A.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116372242416.jpg" /><br /> B.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116372748968.jpg" /><br /> C.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116373495076.jpg" /><br /> D.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116373950755.jpg" /><br /> E.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116374889300.jpg" /><br /> F.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018080116375347013.jpg" />
A、A.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715253748274.jpg" /><br /> B.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715254192159.jpg" /><br /> C.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715254446111.jpg" /><br /> D.<img src="https://img.ppkao.com/2018-07/zhanglijun/2018072715254768261.jpg" />
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" />
A、某材料的应力幅和失效循环周次如下：<br /> <img src="https://img.ppkao.com/2018-09/chenmenghui/2018092811424376274.jpg" /><br /> <img src="https://img.ppkao.com/2018-09/chenmenghui/2018092811425951475.jpg" /><br /> 试绘制S－N曲线，并确定疲劳极限；如设计要求最少疲劳寿命105次，则许用的最大循环应力是多少？
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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