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【简答题】
记函数f（x）的定义域为D，若存在x 0 ∈D，使f（x 0 ）=x 0 成立，则称以（x 0 ，x 0 ）为坐标的点为函数f（x）图象上的不动点． （1）若函数 f(x)= 3x+a x+b 图象上有两个关于原点对称的不动点，求实数a，b应满足的条件； （2）设点P（x，y）到直线y=x的距离 d= |x-y| 2 ．在（1）的条件下，若a=8，记函数f（x）图象上的两个不动点分别为A 1 ，A 2 ，P为函数f（x）图象上的另一点，其纵坐标y P ＞3，求点P到直线A 1 A 2 距离的最小值及取得最小值时点P的坐标． （3）下述命题“若定义在R上的奇函数f（x）图象上存在有限个不动点，则不动点有奇数个”是否正确？若正确，请给予证明；若不正确，请举一反例．若地方不够，可答在试卷的反面．
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举一反三
【单选题】Investors usually __________________, because long-term securities have a greater risk of capital loss than do short-term securities.
A.
require a higher yield on long-term securities
B.
require a lower yield on long-term securities
C.
pay a higher price for long-term securities
D.
avoid long-term securities
【单选题】The variance of a portfolio of risky securities
A.
is a weighted sum of the securities' variances.
B.
is the sum of the securities' variances.
C.
is the weighted sum of the securities' variances and covariances.
D.
is the sum of the securities' covariances.
【单选题】Securities dealers _________
A.
hold inventories of securities, which they sell to customers who want to buy.
B.
hold securities that they have purchased from customers who wanted to sell.
C.
are called market takers, as they have significantly cut into the market that brokers used to dominate.
D.
do all of the above.
E.
do only A and B of the above.
【单选题】The China Securities Regulatory Commission (CSRC) - the nation's securities watchdog - announced the move on its ( ).中国证监会-我国的证券监管机构-在它的网站上宣布了这一措施。
A.
website
B.
site
C.
address
D.
kite
【单选题】The difference between on-the-run and off-the-run U.S. Treasury securities is that on-the-run Treasury securities are:
A.
traded only in the primary market, while off-the-run Treasury securities are traded only in the secondary market.
B.
enerally less actively traded than off-the-run Treasury securities and provide less reliable market yields.
C.
the most recently auctioned Treasury securities in each maturity, while off-the-run Treasury securities are issues auctioned previously.
【单选题】Accumulated Other Comprehensive Income in the shareholders' equity section of the balance sheet reflects changes in the fair value of securities for which type of securities?
A.
Trading securities.
B.
Securities available for sale.
C.
Consolidated securities.
D.
Held-to-maturity securities.
【单选题】下列对砌筑填充墙砌筑叙述正确的是( )
A.
错缝搭砌,蒸压加气混凝土砌块搭砌长度不应小于砌块长度的1/2;轻骨料混凝土小型空心砌块搭砌长度不应小于90mm;竖向通缝不应大于2皮。
B.
错缝搭砌,蒸压加气混凝土砌块搭砌长度不应小于砌块长度的1/3;轻骨料混凝土小型空心砌块搭砌长度不应小于90mm;竖向通缝不应大于2皮。
C.
错缝搭砌,蒸压加气混凝土砌块搭砌长度不应小于砌块长度的1/2;轻骨料混凝土小型空心砌块搭砌长度不应小于1/3mm;竖向通缝不应大于2皮。
D.
错缝搭砌,蒸压加气混凝土砌块搭砌长度不应小于砌块长度的1/3;轻骨料混凝土小型空心砌块搭砌长度不应小于1/3mm;竖向通缝不应大于2皮。
【单选题】What is the maximum period for publicly issuing securities on the securities market?
A.
90 days
B.
60 days
C.
30 days
【单选题】下列对砌筑填充墙砌体的水平灰缝厚度和竖向灰缝宽度叙述正确正确的是()
A.
烧结空心砖、轻骨料混凝土小型空心砌块的砌体灰缝应为8~12mm。蒸压加气混凝土砌块砌体当采用水泥砂浆、水泥混合砂浆或蒸压加气混凝土砌块砌筑砂浆时,水平灰缝厚度及竖向灰缝宽度不应超过15mm
B.
烧结空心砖、轻骨料混凝土小型空心砌块的砌体灰缝应为10~12mm。蒸压加气混凝土砌块砌体当采用水泥砂浆、水泥混合砂浆或蒸压加气混凝土砌块砌筑砂浆时,水平灰缝厚度及竖向灰缝宽度不应超过20mm
C.
烧结空心砖、轻骨料混凝土小型空心砌块的砌体灰缝应为8~10mm。蒸压加气混凝土砌块砌体当采用水泥砂浆、水泥混合砂浆或蒸压加气混凝土砌块砌筑砂浆时,水平灰缝厚度及竖向灰缝宽度不应超过15mm
D.
烧结空心砖、轻骨料混凝土小型空心砌块的砌体灰缝应为8~15mm。蒸压加气混凝土砌块砌体当采用水泥砂浆、水泥混合砂浆或蒸压加气混凝土砌块砌筑砂浆时,水平灰缝厚度及竖向灰缝宽度不应超过20mm
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