题目内容

CCITT和EIA RS-232都是物理层的电气特性标准，其中CCITT的V.11建议中规定 (138) 。常用的EIA RS-232接口的电气特性与CCITT的 (139) 兼容，并且，在这种电路中，数据“1”的接口电平规定为 (140) 。在RS-232定义的接口线中， (141) 表示计算机请求发送数据， (142) 表示计算机准备接收数据。

A. -3～-15V
B. +3～+15V
C. +5～+15V
D. -5～-15V

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下列计算公式中正确的是( )。

A. 每个劳动力平均负荷人口=汇总人口数÷平均劳动力数
B. 每个劳动力平均负荷人口=汇总人口数÷外出劳动力数
C. 每个劳动力平均负荷人口=汇总人口数÷汇总劳动力数
D. 每个劳动力平均负荷人口=汇总人口数÷留守劳动力数

( )是指为了获得统计资料有计划地进行各种调查研究活动。

A. 统计设计
B. 统计资料搜集
C. 统计资料整理
D. 统计资料分析

SALES CONTRACT Contract No. CP1023 Date: 12 July, 2005 Signed at: Shanghai Sellers: Shanghai Textiles Imp/Exp Corp. Buyers: Crombongo Textiles Co., Ltd. This Sales Contract is made by and between the Sellers and the Buyers whereby the sellers agree to sell and the Buyers agree to buy the under-mentioned goods according to the terms and conditions stipulated below:Name of CommodityPattern No.QuantityUnit Price CIF LagosAmountPrinted Shirting7282843,000 yards4,000 yards3,000 yards40p per yard45p per yard50p per yard￡ 1,200￡ 1,800￡ 1,500Total Amount: ￡4.500 Packing: In bales Shipping Mark: At Sellers’ option Insurance: To be covered by the Sellers Port of Shipment: China Port Port of Destination: Lag0s Time of Shipment: During September 2005 Terms of Payment: By confirmed, irrevocable L/C payable by draft at sight upon presentation of shipping documents. Which company would pay the insurance___________________would pay the insurance.

SALES CONTRACT Contract No. CP1023 Date: 12 July, 2005 Signed at: Shanghai Sellers: Shanghai Textiles Imp/Exp Corp. Buyers: Crombongo Textiles Co., Ltd. This Sales Contract is made by and between the Sellers and the Buyers whereby the sellers agree to sell and the Buyers agree to buy the under-mentioned goods according to the terms and conditions stipulated below:Name of CommodityPattern No.QuantityUnit Price CIF LagosAmountPrinted Shirting7282843,000 yards4,000 yards3,000 yards40p per yard45p per yard50p per yard￡ 1,200￡ 1,800￡ 1,500Total Amount: ￡4.500 Packing: In bales Shipping Mark: At Sellers’ option Insurance: To be covered by the Sellers Port of Shipment: China Port Port of Destination: Lag0s Time of Shipment: During September 2005 Terms of Payment: By confirmed, irrevocable L/C payable by draft at sight upon presentation of shipping documents. When would the products be sentThe products would be sent___________________.