在每一班值班时间内，细分员的工作负荷尽量（），避免过分（），（）。
参考答案：分布均匀；集中；忙闲不均
简述蒸汽管道的吹扫方法和合格标准。
A （） is a pre-contract agreement that formally establishes the intent of one party to buy products or services from another party and establishes some preliminary consideration in order to reserve resources for the anticipated contract．
A．seller initial response
B．memorandum of understanding
C．letter of intent
D．letter contract
