对于医疗机构的执业要求规定,医疗机构必须将以下哪项悬挂于明显处,除了()
A.诊疗科目
B.医疗机构执业许可证
C.诊疗医生
D.收费标准
E.诊疗时间
参考答案:C
根据下图,可判断出下列离子方程式中错误的是
A.
B.
C.
D.
—Hurry up, please!
—It's quite early, you _____ worry about the time. [ ]
A. mustn't
B. may not
C. needn't
D. can't