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【单选题】
Covered interest arbitrage moves the market __________ equilibrium because __________.A.
toward; investors are now more willing to invest in risky securities
B.
toward; purchasing a currency on the spot market and selling in the forward market narrows the differential between the two
C.
away from; purchasing a currency on the spot market and selling in the forward market increases the differential between the two
D.
away from; demand for the stronger currency forces up the interest rates on the weaker security
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举一反三
【单选题】There are ________ people in the supermarket ________ we can’t buy things quickly.
A.
too much; to
B.
such many; that
C.
too many; to
D.
so many; that
【简答题】在齿轮传动设计时，软齿面闭式传动常因（）而失效，故通常先按（）强度设计公式确定传动的尺寸，然后验算齿轮的（）强度。
【简答题】齿轮传动设计时，应首先按主要失效形式进行强度计算。闭式软齿面齿轮传动常因为 而失效，故通常先按 确定传动的尺寸，然后验算齿根弯曲疲劳强度。
【多选题】下列有关原函数和导数的联系,说法正确的是:
A.
一个函数的导数一定存在
B.
若函数的导数存在的话,它应该只有一个
C.
若函数的原函数存在的话,它应该有无数个
D.
一个函数的导数的原函数一定是它自己