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【简答题】
如图，已知Rt△ABC，D 1 是斜边AB的中点，过D 1 作D 1 E 1 ⊥AC于E 1 ，连接BE 1 交CD 1 于D 2 ；过D 2 作D 2 E 2 ⊥AC于E 2 ，连接BE 2 交CD 1 于D 3 ；过D 3 作D 3 E 3 ⊥AC于E 3 ，…，如此继续，可以依次得到点D 4 ，D 5 ，…，D n ，分别记△BD 1 E 1 ，△BD 2 E 2 ，△BD 3 E 3 ，…，△BD n E n 的面积为S 1 ，S 2 ，S 3 ，…S n ．则S n =______S △ABC （用含n的代数式表示）．
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举一反三
【单选题】如果信用证中的第 39栏显示“Percentage credit amount:10/10”,则表示( )。
A.
信用证单价允许10%以内的增减
B.
信用证金额允许10%以内的增减
C.
信用证数量允许10%以内的增减
D.
信用证数量和金额都允许10%以内的增减
【单选题】Which of the following is characteristic of acquisition?
A.
form-focused
B.
accuracy-oriented
C.
meaning-focused
【简答题】What are the aims of studying second language acquisition?
【简答题】A．assumption B．consumption C．presumption D．acquisition
【单选题】In a step acquisition, which of the following statements is false?
A.
The acquisition method views a step acquisition essentially the same as a single step acquisition.
B.
Income from subsidiary is computed by applying a partial year for a new purchase acquired during the year.
C.
Income from subsidiary is computed for the entire year for a new purchase acquired during the year.
D.
Obtaining control through a step acquisition is a significant measurement event.
E.
Pre-acquisition earnings are not included in the consolidated income statement.
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