急性心肌梗死99Tcm-焦磷酸盐显像中,下列哪一期间无阳性发。()
A.起病24小时内
B.起病后1~2天
C.起病后3~6天
D.起病后7~14天
E.起病后14天以上
参考答案:E
With your help, there is no doubt ______ our plan is meant for will work out successfully.
A.that what
B.whether that
C.what that
D.that whether
不能用于气体混合物精制的操作是()。
A、吸附
B、吸收
C、冷凝
D、精馏