省公司管理体系设定为（）分。
A.60
B.100
C.180
D.200
参考答案：B
John is very________. If he promises to do something he'll do it. [ ]
A. independent
B. confident
C. reliable
D. flexible
一架飞机作匀速直线飞行时的速度是250m/s，经过1分钟飞机飞行了______m．
