将合适的短语依次填入下列5空:The amount of1that passes through our body2 the3differencedivided by the4between our body and the5.
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将合适的短语依次填入下列5空:If you’re1a2ladder and you touch an exposed3 , the 4will go through you and the ladder5the ground.
将合适的短语依次填入下列5空:If you are standing1, there could be less2difference across you,3you could4be injured or even killed by current5 through your body.
Electricity will only flow if it can travel in a.
A. current
B. circuit
C. circle
D. cycle
The power should be turnedbefore the globe is replaced.
A. out
B. on
C. in
D. off