—Did you enjoy the book?—Yes, it was so_爱下问搜题

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问题选择题

	—Did you enjoy the book? —Yes, it was so interesting that I would not __________ it.
	[ ]
	A. get rid of B. break away from C. keep away from D. tear myself away from

答案

答案：D

选择题

下列对应是从集合A到集合B的映射的是（　　）

A．A=R，B={x|x＞0且x∈R}，x∈A，f：x→|x|

B．A=N，B=N⁺，x∈A，f：x→|x-1|

C．A={x|x＞0且x∈R}，B=R，x∈A，f：x→x²

D．A=Q，B=Q，f：x→

单项选择题

一般来说，高性能点火系统采用的火花塞中心电极与侧电极之间的间隙为（）。

A.0.35

B.0.45~0.55

C.0.70~0.90

D.1.10~1.30