电梯礼仪中，与客人同坐电梯，正确的进出原则是（）

A.股票交易
B．债券交易
C．可转换债券交易
D．金融期货交易

A、pile up ideas and details relevant to your topic
B、should first sort out major details from minor ones
C、should first try to put the details in an appropriate order
D、do none of the above