【判断题】从中性点引出的导线叫中性线,当中性线直接接地时称为零线,又叫接地线。
【判断题】从中性点引出的导线叫中性线,当中性线直接接地时称为零线,又叫地线。
【单选题】Yellow Stone National Park is (one) of the (older) parks in the U.S. It (was established) by (Congress) in 1872.
【单选题】Yellow Stone National Park is (one of) the (older) parks in the U. S. It (was established) by (Congress) in 1872.
【多选题】对于面向对象的开发来讲也分为三个过程是()
【多选题】环境污染按照污染物的形态差异可分为( )
【单选题】Yellow Stone National Park, ________in 1872, _________over three million visitors every year, is America’s first and foremost National Park.
A.
establishing, attracted
B.
having established, attracted
C.
established, attracting
D.
being established, attracting
【单选题】Yellow stone National Park is (one of) the (older) parks in the U. S. It (was established) (Congress) in 1872.
【单选题】What does the speaker say about Yellow Stone national park?
A.
It was the first region explored by pioneers.
B.
It was the first national park.
C.
It is not accessible to everyone.
D.
It is not managed by the National Park Service.
【判断题】从中性点引出的导线叫中性线,当中性线直接接地时称为零线,又叫地线。