题目内容：
按一定比例或一定间隔抽取调查单位的抽样方法为
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答案解析：
单选题：按一定比例或一定间隔抽取调查单位的抽样方法为
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桥梁墩台基础遇砂夹卵石层的地层时，其桩体的施工方法采用（ ）。
桥梁墩台基础遇砂夹卵石层的地层时，其桩体的施工方法采用（ ）。A．射水沉桩 B．锤击沉桩 C．振动沉桩 D．静力压桩
In international air cargo transportation, Bulk Unitization
In international air cargo transportation, Bulk Unitization Rates are only given
Shipped bills of lading and received for shipment bills of l
Shipped bills of lading and received for shipment bills of lading state definite
Under a voyage charter the shipowner retains the operational
Under a voyage charter the shipowner retains the operational control of the vess
在总账系统中，凭证（ ）后可以记账。
在总账系统中，凭证（ ）后可以记账。