Defense plans may cause the operation of electronic aids to

In the following statements about graph operations，which one is NOT correct?

A．Finding critical path is an operation on directed graph

B．Finding critical path is an operation on undirected graph

C．Spanning tree of a graph may not be unique

D．Minimum spanning tree of a graph may not be unique

On discovery of new dangers, of changes or defects in aids to navigation, Masters of vessels should immediately inform ______.

A.their government

B.their port of registry

C.British Government

D.Hydrographer of the Navy of Ministry of Defense of U.K

A warranty may not be a remedy for products delivered unfit when _____ .

A the PM has knowledge of the product, inspected it without relying on the seller's skill

B the products delivered comply with the plans and specifications of the client

C the plans and specifications produced by the seller match the completed product.

D A and B

E None of the above.

Under defense plans，operation of electronic aids may be temporarily suspended with ______．

A.one day's notice

B.no notice

C.thirty（30）day's notice

D.a week's notice

Goods may be dangerous not merely by reason of the fact that they may endanger the safety of the vessel， but also because they are liable to cause the vessel to ________ ．

A.detain

B.be detained

C.be detaining

D.detains

A.essential

B.fundamental

C.elementary

D.inevitable

A.DROP

B.ALTER

C.DELETE

D.ROLLBACK

Electronic commerce may be defined as the entire set of processes that support ______ activities on anetwork and involve information analysis．

A．post

B．exchange

C．transfers

D．commercial

Defense plans may cause the operation of electronic aids to navigation to be suspended with ______.

A.no notice

B.one day's notice

C.a week's notice

D.thirty (30) days notice

Which operation may cause the pressure in an inert tank to fall below the prescribed limits ________．

A.Loading

B.Discharging

C.Crude oil washing

D.Steaming tanks