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【单选题】
可用于人工被动免疫的制剂是:A.
抗毒素
B.
类毒素
C.
BCG
D.
百日咳菌苗
E.
LAK
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【单选题】As an economy moves from a planned economy to a market economy ______.
A.
the companies pay more attention to money
B.
the companies care more about production
C.
the companies hae great emphasis on finished products
D.
the companies don't know what to do
【简答题】在Vector Paint特效中,自绘制图形的当前帧开始，在后续帧中显示图形，直到绘制下一图形时结束显示 符合描述的回放模式是？
【单选题】在Vector Paint特效中,自绘制图形的当前帧开始,在后续帧中显示图形,直到绘制下一图形时结束显示。符合描述的回放模式是
A.
All Strokes
B.
Past Strokes
C.
Hold Strokes
D.
Animate Strokes
【单选题】Which of the following is not one of the three broad types of economic systems?
A.
Market economy
B.
Command economy
C.
Mixed economy
D.
Free economy
【单选题】Which of the following best distinguishes a "command economy" from a "market economy?"
A.
A command economy is more efficient than a market economy because decision making is centralized.
B.
There is scarcity in command economies, but not in market economies.
C.
Command economies are less prone to inflation than are market economies.
D.
Production and distribution decisions are made by central planners in a command economy, but not in a market economy.
【单选题】A barter economy
A.
cannot be a market economy.
B.
is an economy without monetary exchange.
C.
is an economy with no business firms.
D.
is not a competitive economy.
【单选题】______ , the knowledge economy has become the major characteristic of the national economy of most developed countries.
A.
Once in a while
B.
For the time being
C.
From time to time
D.
Once upon a time
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