德士古推荐的煤浆管道流体速度是()。
参考答案:0.6~0.9m/s
He had great influence the manager and could no doubt help you. [ ]
A. of
B. at
C. with
D. in
目前长宽的个人可选增值业务有()
A.互联星空
B.网络卫士
C.商舞精灵
D.以上都不是