I kept looking at the man, wondering _________.
A. whether I have seen him before
B. where I had seen him before
C. that I had seen him before
D. whenver I had seen him before
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It is said that air pollution has ________ the rise of the global temperature
A. led into
B. led to
C. led
D. led by
工作性能试验记录是指通风与空调工程制冷系统完成后,按规范要求必须进行的测试项目。()
工程技术负责人负责对项目经理部进行技术、安全交底;项目经理部技术负责人向专业工长交底;工长负责向班组长及工种进行分部、分项工程技术和安全交底。()
通水试验的目的在于检查各排水点是否畅通,接口处有无渗漏。高层建筑根据管道布置,分区段进行通水试验。()