Considering his health, I advise him to ______ an hour or two each day to work out.

                                                                                                                    [ ]

A. set about

B. set off

C. set up

D. set aside

离合器与制动器属于（）。

A.操纵与控制系统

B.辅助系统

C.传动系统

D.附属装置