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發表於:2024-02-10
1、Theopeninghatchcovermethodalsonottobesatisfiedthatusingthewarpingheadofcargogearnotthroughderrickboomopenthehatchcoverbecauseusingderrickboomisnotsafe.2、Thederrickboo...
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發表於:2018-05-06
stifflegderrickstifflegderricktraveler...
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發表於:2018-01-22
What'sthesafeworkingloadofeachderrick?Studyofforecastingthebearingcapacityofdrillderrickbasedondynamicparameters;Thepyloncellunitswerehoistedtothedeckbythetransferderric...