下列有关日本的叙述正确的是[ ]
A、最大的岛屿是九州岛
B、本州岛和九州岛之间是日本海
C、北海道在四大岛中纬度最低
D、本州岛和四国岛之间是濑户内海
答案:D
______ he didn't know the custom in that country; otherwise, he wouldn't have made such a mistake. [ ]
A. Approximately
B. Accidentally
C. Obviously
D. Occasionally
电气设备发生接地故障,人沿着接地电流的散流方向行走时双脚之间的电位差称为接触电压。