英语 a.m.p.m.结尾,后边还需要加句号吗?逗号问号等肯定要,我想知道的是句号"."是否需要?

a.m.、p.m.、etc.是缩写词,有关标点符号的用法如下：
出现在句尾时,如果句尾是句点（句号）,则句点（句号）可省略,但a.m.、p.m.、etc.本身后面的点需保留,如（1）.如果句尾是问号,则不可省略a.m.、p.m.、etc.后面的点以及问号.
出现在句中,或者后面接逗号、破折号、冒号时,a.m.、p.m.、etc.的点不可省略,如（2）（3）（4）.
（1）Yorktown Daily is slowing updates as the storm moves through Virginia,effectively stopping regular updates at 10 p.m.
（2） We will be back reporting at 7 a.m.tomorrow.
（3） Voting sites across the county will be open from 7 a.m.to 7 p.m.Tuesday in the Republican and Democratic party primaries.
（4）The access ramps from Telegraph Road southbound and northbound to the Inner Loop (I-95/495 South) will be closed during daytime hours for roadway construction from Monday,May 9 through Thursday,May 12 from 9:30 a.m.– 3:30 p.m.,and on Friday,May 13 from 9:30 a.m.– noon.
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