问题
选择题
对密度公式ρ=m/V的正确理解是 [ ]
A．同种物质的质量跟体积成正比
B．同种物质的密度跟其质量成正比
C．同种物质的密度跟其体积成正比
D．以上说法都不对
答案
答案：A
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对密度公式ρ=m/V的正确理解是 [ ]
A．同种物质的质量跟体积成正比
B．同种物质的密度跟其质量成正比
C．同种物质的密度跟其体积成正比
D．以上说法都不对
答案：A
An investor buys a call option with a $25 exercise price priced at $4 and writes a call option with a $40 exercise price priced at $2.50. If the Price of the stock increases to $50 at expiration and the options are exercised on the expiration date, the net profit at expiration (ignoring transaction costs) is:
A．
| A. $8.50. |
B．
| B. $13.50. |
C．
| C. $16.50. |