下述哪项不是心力衰竭发病因素()
A.心肌梗死
B.高血压病
C.低钾血症
D.风心病
E.心肌病
参考答案:C
--- Mrs. Brown, I don’t think we can get there on time by bike.
--- You mean it’s ___________ for us to take a taxi?
A.necessary
B.important
C.possible
D.difficult
暖磨时升温速度应控制在(),时间一般控制在(),暖管应充分,若煤粉潮湿或长时间停用,应适当延长时间。