I got to love Hangzhou ______ I went there in 2001 and that was the first time that I ______Longjing TeA. A.the first time; had tasted
B.
for the first time; had tasted
C.
the first time; have tasted
D.
for the first time; tasted
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【简答题】(本题满分14分).如图所示,四棱锥 P - ABCD 的底面积 ABCD 是边长为1的菱形, ∠ BCD =60°, E 是 CD 的中点, PA ⊥底面积 ABCD , PA = . (Ⅰ)证明:平面 PBE ⊥平面 PAB ; (Ⅱ) 过PC中点F作FH//平面PBD, FH交平面ABCD 于H点,判定H点位于平面ABCD的那个具体位置?(无须证明) (Ⅲ)求二面角 A - BE - P 的...