直流電機(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)(jī)廠(chǎng)