The ____ is the most accurate position-fixing equipment. A. SART B. HiFix C. DGPS D. EPIRB

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Ampere-second is the unit of ____.

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____ is where delicious food is cooked.A. The funnelB. The messroomC. The galleyD. The satellite antenna

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The normal chest x-ray seen below is not technically adequate. The reason is ____.

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The correct tightening is obtained by the use of ____ to measure the extension given to the bolts

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On no account ____ to be exceeded. (超过）A. is the SWL of the craneB. are the SWL of the craneC. the SWL of the crane isD. the SWL of the crane are

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