鲜血便见于
A．溃疡性结肠炎
B．痔
C．直肠肿瘤
D．细菌性痢疾
E．肛裂
参考答案：B,C,E
I _____ of your trying to earn some money by taking part time jobs, but please don’t neglect your studies at university.
A．assess
B．acquire
C．appreciate
D．approve
下面不是EDI三要素的是( )。
A．软件B．硬件C．通信网络以及数据标准化D．电子技术
