A、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/1d62b270-2aa9-11ea-83fe-107b44152a3b.jpg">
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/1d97b100-2aa9-11ea-9d24-107b44152a3b.jpg">
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/1dcf12b8-2aa9-11ea-9c57-107b44152a3b.jpg">
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/1dff52a8-2aa9-11ea-8100-107b44152a3b.jpg">
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