The use of the spirit level fixed to the telescope of a leveling instrument is
ATo make the line of sight vertical
BTo make the line of sight horizontal
CTo compute the difference in elevations
DTo establish the G.T.S. Bench mark
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സുഗന്ധവ്യഞ്ജാനോൽപ്പാദനത്തിൽ കേരളത്തിൽ ഒന്നാമത് നിൽക്കുന്ന ജില്ല ഏത്?