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【判断题】
Now, English is used as the first language and official language in Singapore.()A.
正确
B.
错误
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举一反三
【单选题】If the production possibilities curve is a straight line:
A.
opportunity costs increase as output of either commodity is expanded.
B.
resources are not equally substitutable between the production of the goods.
C.
opportunity costs are negative.
D.
as an increasing quantity of resources are shifted from one manufacturing process (good Y) to another (good X), there is no increase in opportunity cost.
【简答题】试从电极头温度、弧焰温度、稳定性及主要用途比较三种常用光源(直流、交流电弧,高压火花)的性能。 光源 电极头温度 弧焰温度 稳定性 主要用途 直流电弧 交流电弧 高压火花
【单选题】光滑曲面与竖直平面的交线是抛物线,如图所示,抛物线的方程为y=x 2 ,其下半部处在一个水平方向的匀强磁场中,磁场的上边界是y=a的直线(图中的虚线所示),一个质量为m的小金属块从抛物线y=b(b>a)处以速度v沿抛物线下滑,假设抛物线足够长,则金属块在曲面上滑动的过程中产生的焦耳热总量是
A.
mgb
B.
mv 2 /2
C.
mg(b-a)
D.
mg(b-a)+mv 2 /2
【判断题】If we draw a straight line through the points in a scatter diagram and most of the points fall close to the line, we say that there is a positive linear relationship between the two variables.
A.
正确
B.
错误
【简答题】A．祛风湿，补肝肾，强筋骨，安胎 B．祛风湿，强筋骨，利水消肿 C．补肝肾，强筋骨，安胎 D．补肝肾，行血脉，续筋骨，安胎止漏 E．补肝肾，强筋骨，祛风湿 杜仲的功效是( )
【单选题】杜仲的功效是( )
A.
补肝肾，强筋骨，安胎
B.
补益肝肾，强筋健骨，止血安胎，疗伤续折
C.
补肝肾，强腰膝，祛风湿
D.
活血续伤，补肾强骨
E.
滋阴补肾，凉血止血
【简答题】A．祛风湿，补肝肾，强筋骨，安胎 B．祛风湿，强筋骨，利水消肿 C．补肝肾，强筋骨，安胎 D．补肝肾，行血脉，续筋骨，安胎止漏 E．补肝肾，强筋骨，祛风湿 杜仲的功效 A． B． C． D． E．
【单选题】Kevin: Is the restaurant any good? Tommy: ______, but you have to try it for yourself.
A.
I think it' s great
B.
Don't worry about it
C.
It' s a joke
D.
I' ve never been there
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