利多卡因对哪种心律失常无效
A．急性心肌梗死引起的室性心律失常
B．心室纤颤
C．阵发性室性心动过速
D．心房纤颤
E．室性早搏
参考答案：D
已知34x2与5nxn是同类项，则n等于 [ ]
A．5
B．3
C．2或4
D．2
Do you think that bridge 2000 meters long? It doesn’t appear ______long.
A．measures; that
B．is measured; so
C．is measured; such
D．measures; much
