汽油发动机的点火提前角由（）等装置来控制。
A.辛烷值较正器
B.VSV阀
C.离心机械
D.进气真空度膜盒
E.步进电机
参考答案：A, C, D
What do you buy _____ that store? [ ]
A. from
B. on
C. to
用标准访问控制列表禁止非法地址192.168.0.0/16的数据包进出路由器的正确配置是______。
A．access-list 110 deny 192.168.0.0 0.0.255.255 access-list 110 permit anyB．access-list 10 deny 192.168.0.0 255.255.0.0 access-list 10 permit anyC．access-list 50 permit any access-list 50 deny 192.168.0.0 0.0.255.255D．access-list 99 deny 192.168.0.0 0.0.255.255 access-list 99 permit any
