下列哪种疾病可出现奇脉（）
A.二尖瓣狭窄
B.左心衰竭
C.缩窄性心包炎
D.先天性心脏病动脉导管未闭
E.主动脉瓣狭窄
参考答案：C
雨天在注意安全前提下可进行露天电焊作业。（）
Regulations on the levy of import duties on incoming passenger’s luggage and articles shall be formulated by ______. A. the Customs General Administration B. the Tariff Commission C. the State Council D. the Economic Planning Commission
