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Germany
Practice Relating to Rule 10. Civilian Objects’ Loss of Protection from Attack
Section B. Situations of doubt as to the character of an object
Germany’s Military Manual (1992) provides: “An objective which is normally dedicated to civil purposes shall, in case of doubt, be assumed not to be used in a way to make an effective contribution to military action, and therefore be treated as a civilian object.” 
Germany, Humanitarian Law in Armed Conflicts – Manual, DSK VV207320067, edited by The Federal Ministry of Defence of the Federal Republic of Germany, VR II 3, August 1992, English translation of ZDv 15/2, Humanitäres Völkerrecht in bewaffneten KonfliktenHandbuch, August 1992, § 446.