对高温、高压锅炉,烘炉期间的上水应采取()。
A、一般工业水
B、除盐水
C、软化水
参考答案:C
Is that_________ pencil case?[ ]
A. he
B. him
C. his
D. he's
胃食管反流病,由过多的胃十二指肠内容物入食管所致