五加皮具有的功效是
A.祛风湿,强筋骨,养血安胎B.祛风湿,强筋骨,通经脉C.祛风湿,强筋骨,利尿消肿D.祛风湿,止痛,利尿消肿E.祛风湿,退虚热,清湿热
参考答案:C
在学生表STUD中,查询年龄在20至23岁之间的学生的姓名(xm),年龄(SA)和所在系(SD),实现该功能的正确SQL语句是( )。
A.SELECTXM, SA, SD FROM STUDWHERE BETWEEN 20<SA<23
B.SELECTXM, SA, SD FROM STUDWHERE SA BETWEEN 23 AND 20
C.SELECTXM, SA, SD FROM STUDWHERE SA NOTBETWEEN20 AND 23
D.SELECTXM, SA, SD FROM STUDWHERE SA BETWEEN 20 AND 23
如何理解《合同法》的“自愿原则”?