钢号Q345A中的345表示钢材的（）。
A:
值
B:
值
C:
值
D:
值
A:
值B:
值C:
值D:
值
举一反三
- 时序逻辑电路如下图所示，其状态方程组是。（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/75fb6bc0f79d4332b5bdc69605562aba.png" > A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/5f963aec69ea48089a47d3cea9ec8f96.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/4a0262f12d584d86a85b3d0917a539aa.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/0733702e95cb4432b6847bfa287c88cc.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/b4619d1e5055487c984ea3b0b338ee02.png" >
- 用三线-八线译码器74LS138和辅助门电路实现逻辑函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/c871492b27384497a59d367211b93efb.png" >，应：（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/37b75181b0ad4fba92ee10f87ffa0bbb.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/453b2c724d1d4d41898e10c9ba036a39.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/2c10ee737f77406fa0457e0f02318515.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/9cbe3266526b4e8eab204cf96440be55.png" >
- 下列几个方程，表示质点振动为“拍”现象的是：（） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/9667dbfe77314804a8c29f40c44cd0eb.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/c7bc921fc7c04ce6832fea3a190e7d8d.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/87e37e83ce244721905379b745be2bba.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202003/026e1391030345459a10867db4150d25.png">
- 通过点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a13927df1bf542dfa036a32b10364f69.png" />的拉格朗日插值基函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/65695a42c7a14b649b6aa4fb68f7e499.png" />满足( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />＝1，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />＝1，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />＝0，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=0，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/f80e8e400f3f4916bcaf6b5fde757f16.png" />
- 哪个标记用于表示 HTML 文档的结束？( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/6c4425eb00dd44f2a456cd3fa4e18488.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0db52a7ca0c0403d9f0e9f9784a1c655.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0f4f1b4846f940448a74df9e286abc77.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0dfd6a6c8d0f4ed2872185be16c2a849.png" />