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【单选题】
Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31a.m.on a holiday when traffic was light on the city's highways. In addition, changes made to the constructions codes in Los Angeles during the last 2O years have strengthened the city's buildings and highways, making them more resistant to earthquake. Q: One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that____.A.
new computers had been installed in the buildings
B.
it occurred in the residential rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements had been made in the construction of buildings and highways
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【单选题】真空中两个相距为r的相同金属小球(可视为点电荷),带异种电荷,并且电荷量之比为1:7,两球相互接触后再放回原来的位置上,则它们间的库仑力可能为原来的( )
A.
4/7
B.
3/7
C.
9/7
D.
16/7
【单选题】两个完全相同的金属小球，带异号电荷，其电荷量之比为1∶7，相距为r,两者相互接触后在放回原来的位置上，则它们间的库仑力可能为原来的
A.
3/7
B.
5/7
C.
4/7
D.
9/7
【简答题】B 类 IP 地址中的前二个 8 位组表示()地址, 后二个 8 位组表示()地址。
【单选题】两个完全相同的金属球A和B带电荷量之比为1:7,相距为r 。 两者接触一下放回原来的位置,若两电荷原来带异种电荷,则后来两小球之间的静电力大小与原来的静电力之比是()
A.
16:7
B.
9:7
C.
4:7
D.
3:7
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