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【单选题】
Statistics over four consecutive years showed that four percent more automobile accidents happened in California during the week following the switch to daylight saving time and during the week following the switch back to standard time than occurred the week before each event. These statistics show that these time changes adversely affect the alertness of California drivers. The conclusion in the argument above is based on which of the following assumptions?A.
Drivers in California as well as those in the rest of the United States have similar driving patterns.
B.
The observed increases in accident rates are due almost entirely to an increase in the number of minor accidents.
C.
Four years is not a sufficiently long period of time over which to judge the phenomenon described.
D.
There are no other factors such as school vacations or holiday celebrations that cause accident rates to rise during these weeks.
E.
A time change at any other time of year would not produce a similar increase in accident rates.
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【单选题】光缆弯曲半径应不小于光缆外径的()倍,工程中应不小于光缆外径() 倍。端头应做密封防潮处理,不得渗水。
A.
10、15
B.
15 、 20
C.
20 、 25
D.
25、30
【单选题】【背景资料】某施工单位承接一通讯工程施工，根据图纸资料有杆路工程、管道光（电）缆敷设、埋式光（电）敷设、架空光（电）缆敷设、光（电）缆接续与成端、光（电）缆交接箱与分线设备安装等内容，现进场进行施工。
请根据背景资料完成相应小题选项，选项类型根据各小题注明要求，把所选项在答题卡相应题号中填涂，在题本上答题无效！其中，判断题二选一（A.B选项），单选题四选一（A.B.C.D选项），多选题四选二或三...
A.
5
B.
8
C.
10
D.
15
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