洋地黄化病人主张术前何时停用洋地黄药()
A.24~48小时
B.12~24小时
C.48~72小时
D.3~4天
E.1周
参考答案:A
导致北魏实行均田制的根本因素是( )
A.汉族地主的建议
B.南北对峙的形势
C.民族矛盾的激化
D.中原地区先进经济形态的吸引
_________ Michael Jackson has left us, his songs will be in our hearts forever.
A.However
B.Because
C.Although
D.But