心脏收缩力增强时,静脉回心血量增加,这是因为 ( )
A.动脉血压升高
B.血流速度加快
C.心排出量增加
D.舒张期室内压低
E.静脉压增高
参考答案:D
填入适当的单词
小题1:I have given you some (具体的,明确的)examples.
小题2:They (采用) different approaches to the problem.
小题3:This novel is (典型的)of his early work.
小题4:He told me with (悲伤)that his mother was ill.
小题5:His casual clothes were not (适当的)for such a formal occasion.
小题6:Your room looks old. Why not (改造,转换) it by painting it.
小题7:The lady has an expensive ring with a d in the center.
小题8:My father has q smoking.
小题9:There are many (幸存者)from the fire for the timely rescue.
小题10:All the (女性的)workers are from China.