— Whose are those books?
— They are _____. [ ]
A. our
B. mine
C. your
D. their
答案:B
DQ35型钳夹车重车内导向工况允许通过最小曲线半径()。
A.145m
B.150m
C.160m
D.180m
3/2断路器接线有何优、缺点?