【单选题】按照( )的原理,建筑工程图纸分为建筑平面图、立面图和剖面图
【简答题】三视图的形成: 从物体的前面向后面投影,在 V 面得到的视图称为( )。 从物体的上面向下面投影,在 H 面得到的视图称为( )。 从物体的左面向右面投影,在 W 面得到的投影称为( )。
【单选题】Our earth can only be effectively saved when ______ .
A.
people of all nations become conscious of the danger and make joint efforts.
B.
governments in developed countries can formulate more strict laws and regulations.
C.
more volunteers can be organized to help the refugees throughout the world.
D.
the living standards of citizens in developing countries can be greatly raised.
【单选题】按照三视图的原理,建筑工程图纸分为建筑平面图、立面图和()。