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【单选题】
频率为50赫的交流电,每一周期为多少秒A.
2
B.
0.2
C.
0.02
D.
0.002
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反馈参考答案：
举一反三
【单选题】If the cross-price elasticity of two goods is negative, then those two goods are
A.
substitutes.
B.
complements.
C.
normal goods.
D.
inferior goods.
【单选题】When can two countries gain from trading two goods?
A.
when the first country can only produce the first good and the second country can only produce the second good
B.
when the first country can produce both goods, but can only produce the second good at great cost, and the second country can produce both goods, but can only produce the first good at great cost
C.
when the first country is better at producing both goods and the second country is worse at producing both goods
D.
Two countries could gain from trading two goods under all of the above conditions.
【单选题】If the cross-price elasticity of two goods is negative, then the two goods are
A.
necessities.
B.
complements.
C.
normal goods.
D.
inferior goods.
【简答题】已知y=f(arcsinx)， ，求y'| x=0
【单选题】If the cross-price elasticity of two goods is positive, then those two goods are_________.
A.
inferior goods
B.
normal goods
C.
complements
D.
substitutes
【单选题】有关DNA双螺旋结构叙述错误的是
A.
DNA双螺旋是核酸二级结构的重要形式
B.
DNA双螺旋由两条以脱氧核糖-磷酸作骨架的双链组成
C.
DNA双螺旋以右手螺旋的方式围绕同一轴有规律地盘旋。
D.
在空间排列上两肌单链从5'至3'端走向相同
E.
两碱基之间的氢键是维持双螺旋横向稳定的主要化学键
【简答题】设y=(e x +log 3 x)arcsinx，求y'．
【简答题】设y=(1+x 2 )arctanx，求y"．
【简答题】设y=arcsinx及y=arccosx，求y'.
【单选题】If the cross price elasticity of demand between two goods is positive, then the two goods are
A.
Complementary goods
B.
Inferior goods
C.
Unrelated goods
D.
Substitute goods
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