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【单选题】
In the figure, if the economy is at point A, which of the following is true?A.
There is a recessionary gap.
B.
There is an inflationary gap.
C.
Point A is the long-run equilibrium point.
D.
None of the above answers are correct.
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举一反三
【简答题】集合框架对应的根接口是_________。(填一个接口名,英文)
【简答题】设D1是由抛物线y＝2x2和直线x＝a，x＝2及y＝0所围成的平面区域；D2是由抛物线y＝2x2和直线y＝0，x＝a所围成的平面区域，其中0＜a＜2． (1)试求D1绕x轴旋转而成的旋转体的体积V1；D2绕y轴旋转而成的旋转体的体积V2； (2)问a为何值时，V1＋V2取得最大值?试求此最大值．
【单选题】The professor asked his students what problems they ____ on friendship.
A.
may have
B.
will have
C.
had
D.
have
【简答题】9.The
students welcome the visitors _____ their school. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>A. to B. for C. in D. at
【单选题】The students will leave school.I_____them a very happy future.
A.
hope
B.
want
C.
expect
D.
wish
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