《特种设备作业人员证》每()年复审一次。
A. 2年
B. 3年
C. 4年
D. 5年
The connected joints of pipe,usually made of three joints of pipe approximately 90 feet long,racked in the derrick when making a trip are called a ______.
A. String
B. Stand
C. Joint
D. Standpipe
按JG5071规定,滑轮(或链轮)应设有防止钢丝绳(或链条)脱槽的装置,并能防止异物进入滑轮(或链轮),滑轮的节径与悬挂钢丝绳的公称直径之比不得小于()。
A. 40
B. 30
Your tanker is carrying a cargo of styrene.Which of the following is NOT a requirement for
A. P/V valves with galvanized parts must be replaced
B. Authorization to carry styrene must be endorsed on the Certificate of Inspection
C. You must have a Certificate of Inhibition provided by the shipper
D. The cargo tank heating coils must be blanked off