单项选择题 What does the DSC control unit do if the GMDSS radio operator fails to insert updated information when initiating a DSC distress alert（）.

单项选择题 The port State control officer will ensure that（）is performed by all crude carriers either required to have a crude oil washing system or where the owner or operator chooses to install a crude oil washing system.

单项选择题 The port State control officer or the surveyor authorized by the port State Administration must be aware that（）may be carried on product carriers.