1.
\((1)\)如图所示的水平放置的平面图形的直观图,它所表示的平面图形\(ABCD\)是 ______
\((2)\) 若直线\(a/\!/α\),直线\(b\subset α\),则直线\(a\)与直线\(b\)的位置关系为 ______ .
\((3)\)如图,在圆柱\(O_{1}O_{2}\)内有一个球\(O\),该球与圆柱的上、下底面及母线均相切,记圆柱\(O_{1}O_{2}\)的体积为\(V_{1}\),球\(O\)的体积为\(V_{2}\),则\(\dfrac{{{V}_{1}}}{{{V}_{2}}}\)的值是 ______
\((4)\)如图,在棱长为\(1\)的正方体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,点\(E\),\(F\)分别是棱\(BC\),\(CC_{1}\)的中点,\(P\)是侧面\(BCC_{1}B_{1}\)内一点,若\(A_{1}P/\!/\)平面\(AEF\),则线段\(A_{1}P\)长度的取值范围是 ______ .