真理具有相对性，依靠人的思维只能达到逻辑的真。()
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Which safety precaution（s）should be observed during crane operations ________．
A. Checking for proper lifting from beneath the load during cargo operations
B. Using the proper slings or other lifting devices during cargo operations
C. Relaying communications to port agents on the pier during cargo hoists
D. All of the above
In Cargo Survey，T．C．V．refers to ______．
A. total calculated volume
B. terminal cargo volume
C. tank cargo valve
D. tolerance of cargo valve
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