急性病毒性心肌炎患者，心衰Ⅲ级，治疗中下列哪类药物宜慎用()
A．利尿剂
B．洋地黄
C．硝普钠
D．消心痛
E．伊哪普利
参考答案：B
He has ___ letters to answer and has to work from morning to night. [ ]
A. much
B. a great deal of
C. masses of
D. the number of
简述化工技术经济的预测性特点。
