在酸水条件下加热, 中药材组织易变黑者提示可能含的化学成分是（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/93cdb7a4254a4a6bbc9ead0fe751ab3f.png
举一反三
- 在酸水条件下加热, 中药材组织易变黑者提示可能含的化学成分是（）。http://...bc9ead0fe751ab3f.png
- 图示螺钉在拉力F作用下。已知材料的剪切许用应力[τ]和拉伸许用应力[σ]之间的关系为：[τ]=0.6[σ]。试求螺钉直径d与钉头高度h的合理比值。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/ea5aac2943c148f0898270443ef13de6.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/aa9810483bad40828ce87767240d1292.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/020a3681565242b99d12bf523efb96ad.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/337cbe73f1c7414b888c54365465b39d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/eb5408a49bfd47db91aaf04e7780d90c.png" />
- 下列化合物有旋光性的是( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/42754375451947b4a2097a204914e285.png" border="0" vspace="0" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/259cc0f9369441888e4306c19039152f.png" border="0" vspace="0" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/c6798f5eb7e14df7a79f40cdd7d2f42e.png" border="0" vspace="0" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/4275928f484d4bad94705297fe159cf0.png" border="0" vspace="0" />
- 以下操作，可以将数据放入列表A的是：（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/be509830d9fa481e937a24d1e2d9ad46.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/56c2e754f3684727b65b6eb649aff2fa.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/a591d719880b457ea72ff0b84b29d4e9.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/deca818437954173af522e786916847f.png" />
- 以下那些操作可以新建一个背景？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/40aa135f5f0a475f971257bb827504fb.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/9307bb62780f4beb9816a80655aa869f.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/4c22f5c8020040beaa0fe566345b7eb9.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/e66c4f191e944062b31d06d70642aa3f.png" />