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患者有上腹痛史,经常黑粪及呕血、反酸,应考虑()
A. 胃、十二指肠溃疡出血
B. 胃癌出血
C. 食管静脉破裂出血
D. 应激性溃疡出血
E. 胆道出血
What are three actions performed by the mysql_secure_installation tool?()
A. It prompts you to set the root user account password
B. It checks whether file permissions are appropriate within datadir
C. It asks to remove the test database, which is generated at installation time
D. It can delete any anonymous accounts
E. It verifies that all users are configuration with the longer password hash
电缆的绝缘材料采用交联聚乙烯时允许的短路温度为250℃。
A. 正确
B. 错误
一般情况下220KV同杆并架双回线路发生同时性故障时,允许同时跳开双回线路,且不重合
A. 正确
B. 错误