下列各表达式中错误的是__ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/dd20f9d2c1984b1f95ffd89fdf3fed61.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/a7138f62245042a4a604eee2ce27ae93.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/53b05040965a40629cf24d6c90bc7e27.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/8bbfc40de0d6420aa10e572ce4a7b5dd.png">

下列配合物属于螯合物的是（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/8f51868d3100497c9f78fe09ba550e3f.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/025b639d0fe9456997a0191bdeb0019a.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/154fd181ff4d421d96ab4d50e3052020.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/fbd3f97989994e40a247c9ea17663bd0.png" />

如果想要改变scratch显示的语言，应该点击哪个图标？ A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/1bded78c5d3b4c02b8537e3a820552f7.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/6c31384ced4e441db596e354ec3ed1eb.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/1fc4d7ad5746489681ffe8f3a9068cdf.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/2fe104d8b0194718a8b6b83663f83cb4.png">

下图要完成10进制计数器，数据端数据D3D2D1D0=（ ）。[img=197x159]18033fe0448b861.png[/img] A: 1011 B: 1010 C: 1000 D: 1001

下图要完成10进制计数器，数据端数据D3D2D1D0=（ ）。[img=214x167]18031d072de5d0c.png[/img] A: 1000 B: 1001 C: 1010 D: 1011