On this purpose, the performence of free shrinkage of mortar and restrained shrinkage of concrete were studied.
为实现这一目的，作者研究了砂浆的自由收缩规律与混凝土的环形约束收缩规律。
The Performence of spirally indented heat exchanger tubes is compared with smooth tubes under experiment of sealing.
本文对滚压螺旋槽铜管在结垢工况下与光管进行了性能比较试验。
The Performence of spirally indented heat exchanger tubes is compared with smooth tubes under experiment of sealing.
本文对滚压螺旋槽铜管在结垢工况下与光管进行了性能比较试验。
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