水泥入库应有（），（）各项技术指标均应符合国家现行有关标准。
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监理对混凝土平行检测时，检测数量应不少于承包人检测数量的（）。
A. 2%
B. 3%
C. 4%
D. 5%
脱水器沉砂严重时，需要酸洗垢物，先用（）%酸洗垢，反应停后用水冲洗。
A. 20
B. 30
C. 50
D. 70
辖内往来是指邮政_____与市县局之间发生资金往来、款项划拨的过程。(三级)
Which three statements are true about the application of QoS models？ （）
A. The DiffServ model requires applications to signal the network with QoS requirements.
B. The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.
C. The DiffServ model requires RSV
D. The best effort model is suitable for applications such as file transfer and e-mail
E. The IntServ model requires applications to signal the network with QoS requirements.
F. The IntServ model attempts to deliver a level of service based on the QoS specified by each packet
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