50期 903英语机考题目汇编(14)

B. AIS will “freeze”

C. Largest far away drop out

D. Closes targets drop out

66. [17]What may affect the accuracy of sounding with echo sounder?

A.Sea bottom

B.Ship's speed

C.Speed of current

D.Water temperature and density

67. [1625] Which piece of required GMDSS equipment is the primary source of transmitting locating signals?

A. Radio Direction Finder B. An EPIRB transmitting on 406 MHz

C. Survival Craft Transceiver D. A SART transmitting on 406 MHz

68. [588] How can the SART’s audible tone monitor be used?_____.

A. It informs survivors that assistance may be nearby.

B. It informs survivors when the battery’s charge condition has weakened.

C. It informs survivors when the SART switches to the standby mode.

D. It informs survivors that a nearby vessel is signaling on DSC.

69. [180]The pilot {embarked} the ship at 1830 hours．

A. boarded

B. left

C. piloted

D. loaded

70. [4194]There is a drifting mine ______ in position 21 degrees 31 minutes

North 124 degrees 20 minutes East．

A. report

B. reports