A.正司機(jī)操作,副司機(jī)在場(chǎng)監(jiān)督 B.副司機(jī)操作,正司機(jī)在場(chǎng)監(jiān)督 C.提升機(jī)司機(jī)操作,安全員在場(chǎng)監(jiān)督