(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 的大小.
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【单选题】Which of the following statements regarding the timeline is FALSE?
A.
Date 1 is the end of the first year.
B.
Date 0 is the beginning of the first year.
C.
The space between date 0 and date 1 represents the time period between two specific dates.
D.
You will find the timeline most useful in tracking cash flows if you interpret each point on the timeline as a period or interval of time.
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A.
the debates existing in a certain research area
B.
new and future development in a certain research area