问题描述：
英语翻译
Before commissioning commences it shall be ascertained firstly,that the correct heat meter has been installed
by comparing the heat meter supplier's type and size designation against the system specification.Secondly,
it shall be checked that the heat meter,if a complete instrument,bears the correct pattern approval mark and,
if a combined instrument,that each of the meters sub-assemblies bear the pattern approval marks stipulated
in the pattern approval document for the heat meter installed.
Before commissioning commences it shall be ascertained firstly,that the correct heat meter has been installed
by comparing the heat meter supplier's type and size designation against the system specification.Secondly,
it shall be checked that the heat meter,if a complete instrument,bears the correct pattern approval mark and,
if a combined instrument,that each of the meters sub-assemblies bear the pattern approval marks stipulated
in the pattern approval document for the heat meter installed.
问题解答：
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