拉普拉斯（Laplace）方程的表达式为（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/26731bcad75f41389448b29292940653.jpg" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/40e7e55a72ee44f59b45d20c84ebe3a6.jpg" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/c65a79ea4d754174b99f34020d6e1735.jpg" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/139e8d3dc37941549e7b6b1731243172.jpg" />

下列四种产品中，（）属于主体附加。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/7de8bb1790ee4eccbc8fe23d663cb293.JPG" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/9f76d9ce04cb4729b4739bdd64d5917b.JPG" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/b4d8b1ab0b9c4f5e8d165f7afd487e00.JPG" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/4862f4e33e114c63bcfa3ebf5c112cba.JPG" />

下列四种产品中，（）属于同类组合。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/ee5cc627e4a243ea8fc5025d6736de65.JPG" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/95326815255349e7bb11324655294818.JPG" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/07ebf5a3e62b47d2be75f2574f2bee3e.JPG" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/a46447046f5340d8977c1ffed9a70772.JPG" />

下列四种产品中，（）属于重组组合。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/dd09946bf045417895c8f6ff58a1204f.JPG" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/471a61333c8540d7a058dc69c952e11a.JPG" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/feef7f0c86bf46b09e4376f35f6f8bd9.JPG" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/808892c484f74ea18b075dcf9bb17d08.JPG" />

平面一维稳定渗流的压力分布公式为（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/d08348f3b84f442d87994311dc13686b.jpg" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/2df214c86c5e4103897ba81ce2c6cd98.jpg" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/cc98e4a778cc463c965ac8115e028f86.jpg" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/bc82177c19d44acfa1b365c3d66ed0a4.jpg" />

图示单元体应力状态，沿x方向的线应变εx可表示为（ ）。 <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/9fdd7efe625f4047bb61ef38f5aea871.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/5da2d36f7ef84cbc8396b1e27b775bf4.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/164a3d85fdb6462696d83d62b92b2435.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/9e37e58e1c12442e8e018c0af637dfdf.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/41fd81417e5f47bea1db35fed7c2c44e.png" />

下列积分中能用牛顿-莱布尼兹公式的是（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/379f5cddb00442c9b40088a96c1ffa37.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/5ba6eb575adc4b6e843f8da192b341eb.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/58ec1ed0be3f4cdead7cf900d12681fe.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/a4eab4fe9e9c4fe0b56a15f4678d5e06.png" />

一质点在平面上作一般曲线运动，其瞬时速度为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/072ecbf2079c40debf10e59602baef5a.png" />，瞬时速率为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/a7c386a2ed9641fb872fd3798d8a18d6.png" />，某一段时间内的平均速度为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/fd7b24d84b0c48b29b905c0accbfb682.png" />，平均速率为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/25c97028c3294855859e6d26731aecd6.png" />，它们之间的关系必定有（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/28eb779628f849cb9c561087ac27668c.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/332a22fc817749108da3ea994f11c24e.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/9fee0e92ea9344e18d11908ba83a7529.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/258f415ef0974549b35f450f710027de.png" />

在绘制程序流程图时，表示“条件判断”的符号是【 】 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/999737d003564abda13a025e003fda97.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/e471e08876184d45939dd8639058a382.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/9a703316d25940e4b089eb336deaa0da.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/202e22615902455e95ca7025184f1c62.png" />

在绘制程序流程图时，表示“处理框”的符号是【 】 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/a509700eef8e40de85dfb899b3d8a498.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/9189fd85ff654caab759023622837479.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/0f3918887aaa4f6ea7b49b69cc0d91cb.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/02b3e862bd1243e0a4abd511ea96bab7.png" />