用千分表检查起动机电枢轴是否弯曲，如需校正时，其径向跳动值应超过（）
A.0.15mm
B.0.25mm
C.0.35mm
D.0.45mm
参考答案：A
_____to his research work, the professor cared little about any other things．
A．Devoting
B．Devoted
C．Having devoted
D．To devote
室外落地式交接箱应采用混凝土底座，底座与人（手）孔间应采用（）连通。
A.管道
B.通道
C.钢管
D.硅芯管
