散放在地面上的货物活载程度为()。
A.0
B.1
C.2
D.3
参考答案:A
—How much is this football?
—You may _______ forty yuan for it. [ ]
A. spend
B. take
C. pay
D. cost
救援列车依调度命令出动,出动时间不得超过多长时间?