某燃气公司在办理燃气入户前，要求用户缴纳一笔“预付气费款”，否则不予供气。待不再用气时，用户可申请返还该款项。经查，该款项在用户日常购气中不能冲抵燃气费。根据《反垄断法》的规定，下列哪一说法是正确的?A.反垄断机构执法时应界定该公司所涉相关市场B.只要该公司在当地独家经营，就能认定其具有市场支配地位C.如该公司的上游气源企业向其收取预付款，该公司就可向客户收取“预付气费款”D.县政府规定了“一个地域只能有一家燃气供应企业”，故该公司行为不构成垄断

下列环烷烃中加氢开环最容易的是: ( ) A. 环丙烷 ...

单项选择题下列环烷烃中加氢开环最容易的是: ( ) A.
环丙烷 B.
环丁烷 C.
环戊烷 D.
环己烷

The precautionary principle aims to provide guidance in...

判断题The precautionary principle aims to provide guidance in the development and application of international environmental law where there is scientific uncertainty.( )

Trade exhibitions were considered as a seperate industr...

判断题Trade exhibitions were considered as a seperate industry which 
was inextricably linked with other industries.
正确
错误