若发电机的驱动皮带折断或松动，则可引起发电机的输出电压（）。
A.正常
B.为零
C.减小
D.增大
参考答案：B
An analyst does research about future transaction. In general, which of the following is least likely to prefer for an investor to terminate a future contract at expiration（）
A. Delivery.
B. Closeout.
C. Cash settlement.
顶出机构
