开展5S管理有助于改善工作现场环境，保证产品质量。
参考答案：对
若点P（2m+4，3m+3）在x轴上，则点P的坐标为 ______．
I'm sorry, but I'm too busy to help you now. I can only do one thing .[ ]
A. at one time
B. at a time
C. at time
D. at the time
