简述事务的COMMIT语句和ROLLBACK语句的功能。
参考答案:
COMMIT语句正常提交所有事物,ROLLBACK:回滚提交所有事物
—Hello ! May I speak to Mr. Smich?
— .I'll go and get him. [ ]
A. Speaking
B. Hurry up,please
C. Wrong number
D. Hold on,please
高位小肠梗阻除腹痛外最主要症状是()
A.腹胀明显
B.呕吐频繁
C.叩诊呈鼓音
D.少量排便排气
E.腹部包块