在公制螺纹中，内螺纹和外螺纹的标准是一样的。
参考答案：对
No one would have time to read or listen to an account of everything _____ going on in the world.
A．it is
B．as is
C．there is
D．what is
柳荫街24号院，是北京唯一的一座东西两面临街的四合院，清朝乾隆年间曾是大学士刘墉的家庙。( )
