对于上级公安机关的重要部署及执行有重大社会影响的任务，要在党委的密切领导下进行。( )
参考答案：对
用管式炉法测定含硫量时，试样在900~950℃下燃烧，燃烧时间为（）min.
A.10~20
B.15~30
C.20~40
D.30~40
Mr. Fat has _______ money than Mr. Thin, but he has _______ friends.
A．more, fewer
B．more, less
C．fewer, more
D．less, less
