【单选题】The United States entered the war against Germany ______ .
A.
because Germany declared war
B.
because Japan was an ally of Germany
C.
after Germany had signed the Nazi-Soviet Pact
D.
after peaceful efforts had failed
【单选题】GMDSS的证书要求是由( ) 规定的。
【简答题】The United States entered the war against Germany _________.
【多选题】下列关于螯合物的形成条件的说法中,正确的是: ( )
A.
中心离子有空轨道,能够接受配体提供的孤电子对
B.
多基配体(螯合剂)必须含两个或两个以上都能够给出孤电子对的原子,且这些原子必须同时与同一中心离子配位形成,具有环状结构的配合物
C.
两个或两个以上能给出孤对电子的原子应该相隔两个或三个其它原子,以便与中心离子形成稳定的五元环或六元环。
D.
只有少于五元环或六元环的螯合物不稳定且少见,多于五元或六元环的螯合物稳定且常见
【简答题】A.Dutch and Germany. B.Britain and the US. C.Germany and the United Kingdom. D.Dutch and Scandinavia.
【单选题】What are the vessel equipment and personnel requirements for GMDSS? ()
A.
Two licensed GMDSS radio operators
B.
Equipment carriage requirements
C.
Distress alerting and response
【单选题】Which statement is false regarding the maintenance of GMDSS equipment at sea?
A.
The GMDSS operator may not be the person designated to have primary responsibility for radio communications during distress incidents.
B.
Ships must carry at least one person who qualifies as a GMDSS maintainer for the maintenance and repair of equipment if the at sea maintenance option is selecte
C.
All at sea maintenance and repairs must be performed by, or under the supervision of a person holding a GMDSS First/Second Class Radio Electronic Certificate.
D.
The GMDSS maintainer may be the person responsible for ensuring that the watches are properly maintained and that the proper guard channels and the vessel’s position are entered in the DSC equipment.