Where do you obtain approved placards containing instructions for the launching and inflation of an approved inflatable liferaft? ()
A. Officer in Charge,Marine Inspection
B. The manufacturer of the liferaft
C. Maritime Administration
D. The owner of the vessel on which the liferafts are carried
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在一广场(自由声场)中,离声源主轴方向1m处的声压级为90dB,则离声源主轴方向2m处的声压级为()。
A. 96dB
B. 93dB
C. 87dB
D. 84dB
压延成型机按照辊筒数目和排列方式分,各有哪些种类?斜Z字型排列和倒L型排列方式各自的优点如何?
执行督察任务时,督察人员可以依法采取()段获取信息资料,可以对有关资料进行查阅.复制和封存。
A. 录音
B. 拍照
C. 摄像
D. 讯问
Which of the following DB2 tools allows a user to execute an SQL statement and view a graphical representation of the access plan?()
A. Task Center
B. Command Editor
C. Developer Workbench
D. Command Line Processor