下列选项中，不属于商业银行表内授信的是( )。
A．贷款B．贴现C．透支D．保证
参考答案：D
解析： D属于表外授信。
已知扇形的半径为30cm，圆心角为120°．
（1）求扇形的弧长；
（2）若用它卷成一个无底的圆锥形筒，求出这个圆锥形筒的高．
Which of the following statements regarding exchange-traded derivatives is FALSE Exchangetraded derivatives :()
A. are illiquid and have secondary markets.
B. are standardized contracts.
C. often trade in a physical location.
