A．對(duì)稱準(zhǔn)直器、非對(duì)稱(獨(dú)立)準(zhǔn)直器兩種 
B．對(duì)稱準(zhǔn)直器、非對(duì)稱(獨(dú)立)準(zhǔn)直器、復(fù)式準(zhǔn)直器三種 
C．對(duì)稱準(zhǔn)直器、非對(duì)稱(獨(dú)立)準(zhǔn)直器、多葉準(zhǔn)直器三種 
D．對(duì)稱準(zhǔn)直器、復(fù)式準(zhǔn)直器、多葉準(zhǔn)直器三種 
E．非對(duì)稱(獨(dú)立)準(zhǔn)直器、復(fù)式準(zhǔn)直器、多葉準(zhǔn)直器三種