What could cause a significant difference between actual chain tension and the tension measured by the tensiometer? ()
根据系离泊作业安全要求,下列哪些是正确的()。
Ⅰ.使用拖轮协助靠离时,操作人员应站在系拖缆缆桩的后面;
Ⅱ.靠离时,二副应随时将船尾距离和缆绳收放情况及时报告驾驶台;
Ⅲ.系泊操作时,二副在船尾指挥,水手长一般在船尾协助;
Ⅳ.投掷撇缆时应先招呼后撇出,防止撇缆头伤人。
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?()
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