从多依奇效率公式看，电场风速与除尘效率无关，所以电场风速可以任意选择。（）
参考答案：错
The company's headquarters are ______Shenzhen, a special economical development zone.[ ]
A. based of
B. based on
C. based in
D. based off
如果对质量的监控无法有效落实，那么计件工资就不宜采用。
