治疗强心甙引起的频发室性早搏宜首选（）
B
暂无解析
题目：InvitationLetter邀请与约见函
Anumberofcompaniesusenontraditionalbenefitsandperkstohelpemployeescopewithstress.
Whileonlyabout300workersreceivedisablementbenefitforindustrialdermatitiseveryyear,theremaybebetween15,000and60,000newcasesofthisconditioneveryyear.
Locateacontract
题目：Describinggraphs