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【简答题】
因为sin30 0 = ，sin210 0 = - ，所以sin210 0 =sin（180 0 +30 0 ）= -sin30 0 ； ；因为sin60 0 = ，sin240 0 = - ，所以sin240 0 =sin（180 0 +60 0 ）= -sin60 0 ； 由此猜想、推理知一般地当 为锐角时，有sin（180 0 + ）= -sin ， ； 由此可知sin225 0 =
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举一反三
【单选题】Neoclassical growth theory is based on the proposition that real GDP per person grows when
A.
the population growth rate increases.
B.
the population growth rate decreases.
C.
technological advances occur.
D.
saving decreases.
【单选题】New growth theory proposes that real GDP per person grows because of ________ and that growth ________.
A.
the pursuit of profit; can persist indefinitely
B.
productivity shocks; can persist indefinitely
C.
technological change; can only increase above the subsistence level temporarily
D.
productivity shocks; occurs randomly
【简答题】ARDS的主要四个病理特征为____、______、____和_____。
【单选题】If real GDP grows from $10 trillion in 2002 to $10.5 trillion in 2003, the growth rate for real GDP is ( )
A.
5%.
B.
10%.
C.
50%.
D.
0.5%.
【单选题】Suppose a nation's population grows by 2 percent and, at the same time, its GDP grows by 5 percent. Approximately how fast will real GDP per person increase?
A.
3 percent per year
B.
2 percent per year
C.
5 percent per year
D.
10 percent per year
【简答题】What are the answers to Q1-Q25?
【单选题】When the economy grows, ________ increase because real GDP ________.
A.
tax revenues; decreases
B.
tax revenues; increases
C.
structural deficits; decreases
D.
recognition lags; increases
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