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题目:将两只电阻 R_1、R_2串联后接入某电路中,电路中的电流强度为0.4安;若把这两只电阻并联后接同一电路中,则干路中的电流强度至少是(电源电压保持不变):( )
Title: Two resistors R_1 and R_2 are connected in series after being connected to a circuit, and the current intensity in the circuit is 0.4 A. If the two resistors are connected in parallel and connected in the same circuit, the current intensity in the trunk is at least (power supply). The voltage remains unchanged): ()