【多选题】
A be capable of withstanding without damage drops from a height of 30 m into water.
B be watertight at a depth of 10 m for at least 5 min.
C maintain watertightness when subjected to a thermal shock of 45°C under specified conditions of immersion.
D The height of the installed SART antenna should be at least 3 m above sea-level.
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