单项选择题

Provision must be made in pipe systems for changes in length due to change of temperatureThe bold and italic word “provision” probably means （）.

A.flanges
B.nuts
C.expansion joints
D.bolts

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船舶电气与船舶安全

Provision must be made in pipe systems for changes in length due to change of temperatureThe bold and italic word “provision” probably means （）.