锅炉给水泵轴封的水源应采用软化水。
参考答案：错
解析：锅炉给水泵轴封的水源应采用凝结水。
There seemed no end to their troubles; nowhere _________ upon a path.
A．they could come
B．could come they
C．come they could
D．could they come
当病人出现呕血时，提示胃内潴留血量至少达到
A．5～10 mlB．50～100 mlC．150～200 mlD．250～300 mlE．350～400 ml
