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问题 单项选择题

分火头有故障时，打开分电器盖，接通点火开关，拔出点火线圈高压线对正分火头5～8mm，拨动触点，如有较强的火花，证明分火头（）。

A.被烧断

B.被击穿

C.正常

D.能用

答案

参考答案：B

填空题
计算：20120-32+(
1
2
)-2-tan45°=______．
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选择题

Jane would never have gone to the party ____ that Mary would come to see her.   [ ]

A. has she known                  

B. had she known  

C. if she knows                 

D. if she has known
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