下列四种产品中，（）属于主体附加。
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 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" />
- 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" />
- 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" />
- 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" />