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问题 多项选择题

对于发动机点火系统，以下哪些话语是错误的（）。

A.分电器是必不可少的零部件

B.一辆汽车只能有一个点火线圈

C.火花塞的正负极必须保持一定的间隙

D.分电器轴只能由凸轮轴驱动

答案

参考答案：A, B, D

单项选择题

Assume that there are no transaction costs and that securities are infinitely divisible, ff an 8 percent coupon paying bond (with semi-annual coupon payments) that has six months left to maturity trades at 97.54, and there is a zero-coupon bond with six months remaining to maturity that is correctly priced using a discount rate of 9 percent, is there an arbitrage opportunity（）

A. Yes, the coupon bond price is too low.

B. Yes, the coupon bond price is too high.

C. The coupon bond is not correctly priced but no arbitrage trade can be set up using the zero-coupon bond.
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判断题

当电能表运行在额定最大电流Imax时，误差一般都不能满足准确度的要求。
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