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【多选题】
一幢28层（96m高建筑）的一类高层，建筑物内安装了火灾自动报警系统，水喷雾灭火系统等。火灾自动报警系统接地装置的接地电阻应符合（）要求。A.
采用专用接地装置时，接地电阻值不应小于4Ω
B.
采用专用接地装置时，接地电阻值不应大于4Ω
C.
采用共用接地装置时，接地电阻值不应大于1Ω
D.
采用共用接地装置时，接地电阻值不应小于1Ω
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【简答题】1) When did the United States become an industrial nation?
【简答题】When did the United States begin to equip all the cars sold with seat belts according to the American Automobile Association?
【简答题】When did the United States become an industrial nation?
【单选题】When did the United States Weather Bureau begin to use box kites?
A.
In 1752.
B.
In 1898.
C.
In 1903.
D.
In 1933.
【单选题】When did the United States become the strongest power in the western world?
A.
Before WWI
B.
During WWI
C.
Before WWII
D.
During WWII
【单选题】When did the United States have social security on a national level?
A.
1924
B.
1935
C.
1922
D.
1947
【单选题】When did the United States of America first become a nation?
A.
1786
B.
1976
C.
1776
D.
1881
E.
1781
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