下面螺纹画法正确的有（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/154170f305f9495183d6eadbbfbc7526.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/5c82cb80164d4bff91f00d2433c71f8f.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/71ba69fdd015468dbb356bb55a217725.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/c510d567fcf749eb8b38b64b08a447d8.png" />

下列函数为有界函数的是（ ）. A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/8b29e23e896d48fbb32316cf188c7897.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/00a2ecf9d8814be9996a25fafd9205f8.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/90cc2cce15bb40a08b7c102e9d5eb020.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/df59aabc218b4c67afbd897414705118.png">

关于单边z变换移位性质正确为（）。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/5ba92316b2ec4267b29f78a0768a902b.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/6203fcc7a210423a9d3b99e886ffcd9e.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/64f2fccfd656410f9293ecd0b2bc3245.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/177c36d33ae0450093fb5c373f9c1f76.png" />

下列谓词公式中，( )是等值的。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/3ad0f562353b4463b9b31a3a773c1153.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/85d2bd83d84b43dc83ba5c1749871d69.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/0b76f52c16ba411f96a0030d91b4f8b9.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/4f1748ea22f049dea7381c3f1171c079.png">

以下选项中，全部都是表格标签的是（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/a6c4de14c1e14465ac8f152bc52545ea.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/bc06abdf4a1c419cb5dab725f83a02d0.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/0aeb916868c4476ab7d0549a32a4ca4e.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202002/0cbabf33298048578d5b9ef94a3c2b0c.png" />