社区卫生服务机构主要提供( )服务。
A.社区卫生服务和基本医疗B.基本医疗服务和疑难病症医疗C.社区卫生服务和专科医疗D.疑难病症服务和公共卫生
参考答案:A
一个用二进制表示的IP地址为11001011 01011110 00000010 00000001,那么它的点分十进制表示为【 】
He was crazy ______ his study when he was young, which contributes ______ his success in later life.
A.for; to
B.about; to
C.about; on
D.for; on