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【单选题】
红外辐射本质上热辐射。任何物体,只要它的温度高于绝对零度()度,就会向外发射红外线。A.
-273
B.
0
C.
100
D.
—100
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反馈参考答案：
举一反三
【单选题】When the price level falls, ( )
A.
The interest rate falls because people will want to hold more money and so sell bonds.
B.
Firms will want to spend more on new business buildings and business equipment and households will want to spend more building new homes.
C.
Both A and B are correct.
D.
None of the above are correct.
【单选题】According to the author, one had better______.
A.
buy more shares when the stock price falls down
B.
sell out the shares when the stock price falls down
C.
do some research on the value of a business when its stock price falls down
D.
invest in the business when its stock price falls down
【单选题】Along a linear demand curve, as price falls
A.
the elasticity of demand is constant
B.
the elasticity of demand falls
C.
the elasticity of demand increases
D.
the elasticity is the same as the slope of the demand curve
【单选题】As the market price of a good falls, consumer surplus:
A.
falls.
B.
rises.
C.
does not change.
D.
can either fall, rise, or stay the same.
【判断题】我国高赖氨酸玉米的育种目标是：籽粒中赖氨酸含量不低于0.2%，产量可略低于普通玉米推广杂交种，不发生穗腐或粒腐病，抗大、小斑病，胚乳最好为硬质型。
A.
正确
B.
错误
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