安全生产许可证有效期满需要延期的,企业应当于期满前()向原安全生产许可证颁发管理机关办理延期手续。
A.1个月
B.3个月
C.6个月
D.12个月
参考答案:B
I was shocked ______ the cruelty of Tom, a relative of my wife, who not only shouted ____ the
poor man begging for something to eat but also let his violent dog come _____ him. [ ]
A. at; at; at
B. with; to; at
C. by; to; at
D. for; at; to
市场上销售的加碘食盐、含氟牙膏、高钙牛奶、补铁酱油等,说明了化学与人体的健康密不可分.这里的碘、氟、钙、铁是指( )
A.单质
B.分子
C.元素
D.原子