【单选题】已知 α , β 是平面, m 、 n 是直线,给出下列表述: 1 若 m ⊥ α , m ⊂ β ,则 α ⊥ β ; 2 若 m ⊂ α , n ⊂ α , m ∥ β , n ∥ β ,则 α ∥ β ; 3 如果 m ⊂ α , n ⊄ α , m , n 是异面直线,那么 n 与 α 相交; 4 若 α ∩ β = m , n ∥ m ,且 n ⊄ α , n ⊄ β ,则 n ∥ α ...
【单选题】The examples of Virtual Vineyards, Amazon.com, and other pioneers show that a Web site selling the right kind of products with the right mix of interactivity, hospitality, and security will attract on...