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【单选题】
最常用的全息干涉方法中的一种为二次曝光法，下列选项中对二次曝光法描述正确的是A.
通过二次曝光将标准的物光波波前和变形后的物光波波前，按不同时刻记录在同一张全息图上，再现时，直接比较两个波面的相位差。
B.
通过二次曝光将标准的物光波波前和变形后的物光波波前，按不同时刻记录在同一张全息图上，再现时，通过两个波面之间的干涉条纹了解波面的变化。
C.
通过二次曝光将标准的物光波波前和变形后的物光波波前，按不同时刻记录在两张全息图上，再现时，通过两个波面之间的干涉条纹了解波面的变化。
D.
通过二次曝光将标准的物光波波前和变形后的物光波波前，按相同时刻记录在同一张全息图上，再现时，通过两个波面之间的干涉条纹了解波面的变化。
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举一反三
【单选题】Proper GMDSS watchkeeping includes ______.
A.
monitoring all required frequencies in the proper mode
B.
reading all displays and / or printouts after silencing an alarm
C.
notifying the Master of any distress alerts
D.
All of the above
【单选题】Which of the following documents are required by GMDSS for vessels on international voyages?
A.
A copy of the IMO master plan of shore-based facilities
B.
Station logs
C.
ITU Radio Regulations
D.
All of these
【单选题】Which of the following is a required GMDSS function?
A.
Transmit and receive location signals
B.
Transmit and receive general communications
C.
Both of these
D.
None of these
【单选题】Which of the following is a required GMDSS function?
A.
Bridge-to-bridge communications
B.
Reception of weather map facsimile broadcasts
C.
Both of these
D.
None of these
【单选题】Which statement is TRUE ________．
A.
GMDSS radio logs are required to contain entries pertaining to all incidents connected to radio communication service which appear to be of importance to the safety of life at sea
B.
All distress communications must be entered in the GMDSS radio log．
C.
Both of the above
D.
None of the above
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