单选题 A balance used for weighing drugs or jewels must be a ______ instrument, but this would be quite unsuitable for weighing coal, sand or blocks of stone.
【正确答案】 D
【答案解析】[解析] 形容词词义辨析。balance为名词，意为“天平”，选项中的形容词只有precision(精确的)能与instrument(仪器)搭配。故答案为D。