左心衰竭时发生淤血的脏器是()。
A.脾
B.脑
C.肝
D.肺
E.肾
参考答案:D
When we were having a meeting, the director()the bad news by telephone.
A.was telling
B.was told
C.could tell
D.would tell
5kg、容积为10.0L的容量筒装满干燥石子后的总质量为18.5kg。若向筒内注入水,待石子吸水饱和,为注满此筒共需注入水4.28kg。将上述吸水饱和的石子擦干表面后称得总质量为18.7kg(含筒重)。求该石子的表观密度和堆积密度。