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【单选题】
在蛋白质分子中能生成二硫键的氨基酸残基是:A.
蛋氨酸残基
B.
天冬酰胺残基
C.
脯氨基残基
D.
半胱氨酸残基
E.
缬氨酸残基
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反馈参考答案：
举一反三
【判断题】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 “ All Strokes ”。
A.
正确
B.
错误
【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 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.
【多选题】与氧-乙炔火焰切割相比，氧-丙烷火焰切割的优点有（）。
A.
火焰温度较髙，切割预热时间短
B.
点火温度高，切割时的安全性能髙
C.
成本低廉，易于液化和灌装，环境污染小
D.
选用合理的切割参数时，其切割面的粗糙度较优
【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
【单选题】在Vector Paint特效中,合成图像中自绘制图形的当前帧开始,在后续帧中显示图形。而在绘制前的所有帧中不显示图形。符合描述的回放模式是
A.
All Strokes
B.
Past Strokes
C.
Hold Strokes
D.
Animate Strokes
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