单项选择题

The damaged derrick（）now.

A.has repaired
B.is being repaired
C.is repaired
D.will be repaired

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单项选择题

A.repairing or replacing
B.to repair or to replace
C.being repaired or replaced
D.to be repaired or replaced

单项选择题

A.Application for Inspection
B.Change of Employment
C.Permit to Proceed
D.Temporary Certificate of Inspection

单项选择题

A.thickness of the connected members
B.diameter of the head
C.entire length of the rivet
D.diameter of the shank