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【单选题】
关于飞翼式布局无人机，下列说法不正确的是（ ）A.
飞翼布局是翼身融合布局的一种形式
B.
飞翼布局无人机纵向和横航向控制一般依靠机翼后方的各种襟翼与副翼
C.
飞翼布局无人机隐身性能较好
D.
飞翼布局无人机一般纵向稳定性易于保证
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【判断题】Usually Christmas trees are artificial and people can buy them in the supermarkets.
A.
正确
B.
错误
【单选题】在PowerPoint2010中，在浏览视图下，按住CTRL并拖动某幻灯片， 可以完成_______操作。
A.
复制幻灯片
B.
删除幻灯片
C.
移动幻灯片
D.
选定幻灯片
【单选题】Christmas trees are often considered as a horticultural crop because _____________ .
A.
they are beautiful
B.
they are cultivated on Christmas Day
C.
they assume sufficient value to justify large expenditures for fertilization, pruning, harvesting, and marketing
D.
they are grown for timber or pulp
【简答题】听录音，选择你所听到的句子。 ( ) 1. A. Christmas trees are always green. B. I like all green trees. ( ) 2. A. My mother bought me a sweater yesterday. B. My father brought me a melon yesterday. ( ) 3. A...
【单选题】These two Christmas trees are of ___size,but the one they bought yesterday is maybe twice ___size of them.
A.
the, the
B.
a, the
C.
a, a
D.
the, a
【单选题】在PowerPoint 2003中，在浏览视图下，按住Ctrl键并拖动某幻灯片，可以完成的操作是 ()。
A.
选定幻灯片
B.
复制幻灯片
C.
移动幻灯片
D.
删除幻灯片
【单选题】On December 10 the price of a Christmas tree is $50 and 100 trees are purchased. On December 20 the demand for Christmas trees decreases so that the price falls to $30 and 20 trees are purchased. From...
A.
demand for Christmas trees is price inelastic.
B.
demand for Christmas trees is price elastic.
C.
supply of Christmas trees is inelastic.
D.
supply of Christmas trees is elastic.
相关题目：
【判断题】Usually Christmas trees are artificial and people can buy them in the supermarkets.
A.
正确
B.
错误