桥墩每次往上接砌时，应将纵向及横向中线用吊线法往上引，每砌3～4层应（）一次中线。
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What is the purpose of importing from an export，and specifying that no rows be imported and that the output goes to a log file？（）
A. To verify space requirements in the target database before importing.
B. To generate the SQL for the DDL operations that would occur during import.
C. To check character set compatibility between the export file and the target database.
D. To check for integrity constraint violations that would occur in the target database.
资产负债表是反映企业某一特定日期财务状况的报表。
A. 正确
B. 错误
《铁路线路修理规则》规定的接头阻力C值包含钢轨与夹板之间的磨阻力和螺栓的抗剪力。
A. 正确
B. 错误
一个移动用户要想与另一个移动/固定用户进行通信，必须经过（）和（）两种传输过程。
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