The company should establish procedures to ensure that（）related to safety and protection of the environment are given proper familiarization with their duties.Instructions which are essential to be provided prior to sailing should be identified,documented and given.
A. New personnel
B. Personnel transferred to new assignments
C. All crewmembers
D. New personnel and Personnel transferred to new assignment
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裂解时采用加入稀释剂减压的目的是（）
A. 防止减压操作时漏入空气形成爆炸混合物导致爆炸
B. 降低能耗
C. 降低裂解原料和产物损失
D. 稀释裂解气
CorelDRAW中，图形不可以做以下哪些变换（）
A. 缩放变换
B. 旋转变换
C. 倾斜变换
D. 三维变换
E. 平行变换
In determining a safe speed（）shall not be among those taken into account.
A. the presence of the background light at night
B. the state of wind，sea and current
C. the number of crew on board
D. the draught in relation to the available depth of water
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