All VHF marine band radios operate in the simplex mode，which means that______．A.only one p

A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency

B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received

C.The Operator should immediately set continuous watch on VHF channel 70

D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

All marine low-speed diesels are of what design ________．

A.Four-stroke

B.Two-stroke

C.Electronic ignition

D.Forced exhaust

A.WP, and All Risks.

B.coverage

C.covering

D.cover

E.covers

A.general average loss

B.particular average loss

C.total loss

D.partial loss

The All Risks in PICC Ocean Marine Cargo Clauses does not cover the risks of( ).

A. shortage B. rain damage C. import duty D. taint of odour

A.A. heavy weather

B.B. earthquake

C.C. strike

D.D. hook damage

All risk coverage provide insurance against all risks of damages to the cargos includes( ).

A. losses resulting from marine perils B. general average

C. particular average D. war and strikes

信用证条款：

DOCUMENTS REQUIRED：INSURANCE POLICY COVERING MARINE TRANSPORTATION ALL RISKS，WAR RISKS AS PER INSTITUTE CARGO CLAUSES．

信用证未对投保比例作任何其他规定。

发票显示货物CIF总价为USDl00,000.00，

则保险单最低投保比例应为：（）