四行程发动机完成进、压、爆、排四个动作,产生一次动力,其活塞在汽缸中上下运动各()。
A.一次
B.两次
C.三次
D.四次
参考答案:B
患者杨某,痢下赤白粘冻,白多赤少,腹痛,里急后重,饮食乏味,饱闷,头身重困,舌质淡,苔白腻,脉满缓。证属
A.寒湿痢
B.休息痢
C.噤口痢
D.虚寒痢
E.阴虚痢
An investor purchases a stock for $40 a share and simultaneously sells a call option on the stock with an exercise price of $42 for a premium of $3/share. Ignoring dividends and transactions cost, what is the maximum profit that the writer of this covered call can earn if the position is held to expiration
A.
B.
C.