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【单选题】
人体触电后自己能够摆脱电源的最大电流称为摆脱电流,直流电约为( )mA。A.
40
B.
50
C.
60
D.
70
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【简答题】That rich old man _____ (make) a will befor he ____(die).
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【简答题】That rich old man ____(make) a will before he ____(die).
【简答题】That rich old man________ (make )a will before_________ (die).