配线子系统是指（）。
A、管理间子系统
B、水平区子系统
C、垂直干线子系统
D、设备间子系统
参考答案：B
The doctor insisted I ____ a high fever and that I ____ a rest for a few days. [ ]
A. had; had
B. have; have
C. had; have
D. have; had
固体燃料的燃烧按燃烧特征常分为哪几类？
