There have been many comparisons (比较) made between London Underground and New York Subway. They are the best known public transport systems (公共交通运输系统) in the world and each is a key part of one of the greatest cities of the world. The two systems have many things in common(相同), including their ages and fame（名声）, but there are also important differences.

    The following table shows some of the similarities (类似）and differences.

电压表的示数为8伏时，电流表的示数为多少?

2015年4月25日，南亚国尼泊尔发生8.1级地震，大量外国游客被迫滞留尼泊尔境内，地震发生后，中国启动撤侨事宜，接回中国游客，确保中国海外侨民的安全，地震发生后，中国启动撤侨事宜，接回中国游客，首选的交通工具应该是（  ）