盘上安装的供电设备，其裸露带电体相互间或与其他裸露导电体之间的距离，不应少于（）.
A.1mm
B.2mm
C.3mm
D.4mm
参考答案：D
John does well in school. Furthermore, he takes an active part in the social work. The logical relationship between the above sentences is ______. ( )
A．additive
B．adversative
C．causal
D． temporal
胃痛的主要病变脏腑在胃，但与胃痛关系最密切的脏腑是（）
A.脾、肾
B.脾、肝
C.肺、脾
D.肝、肾
E.心、肝
