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【简答题】
如图甲表示反射弧中三个神经元及其联系，其中表示从树突到胞体，再到轴突及末梢（即一个完整的神经元模式）；图乙表示突触的亚显微结构模式图。据图回答下列问题： 由图中可看出，兴奋在两个神经元间的传递是单向的，其原因是（）。
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举一反三
【单选题】Suppose the annual yield of corporate bond for firm A is 12%, the firm’s marginal tax rate is 40%, the flotation cost of the bond is 5% of the dollar amount issued. Then the cost of bond for firm A is
A.
12%
B.
7.2%
C.
7.6%
D.
7.7%
【单选题】Which chemical bond has the highest bond energy?
A.
covalent bond
B.
ionic bond
C.
metallic bond
D.
hydrogen bond
【单选题】What is the current yield on a five-year 5% coupon bond with $100 face value? Suppose the bond’s yield to maturity is 7%. Assume annual compounding.
A.
5.26%
B.
5.36%
C.
5.46%
D.
5.56%
【单选题】Suppose the interest rate on a taxable corporate bond is 10% and the marginal tax rate is 2.5%. What is the equivalent tax-free interest rate on this bond?
A.
2.5_25
B.
12.5_25
C.
9.25_25
D.
7.5_25
【单选题】Suppose a ten-year bond with semiannual coupons has a price of $1,071.06 and a yield to maturity of 7%. This bond's coupon rate is closest to:
A.
3.5%
B.
6.0%
C.
7.0%
D.
8.0%
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