What does the comment "This is logical." in line 5 of the first paragraph (underlined) mean?
A.There is no clear way to determine the extent of our ancestor's knowledge of plants.
B.It is not surprising that early humans had a detailed knowledge of plants.
C.It is reasonable to assume that our ancestors behaved very much like people in preindustrial societies.
D.Human knowledge of plants is well organized and very detailed.
第1题
流体流动的质量守恒定律可用于计算
A.瓣口体积
B.瓣口内径
C.瓣口面积
D.瓣口流速
E.瓣口流速时间积分
第3题
应用血流的流率守恒定律可计算
A、瓣口体积
B、瓣口内径
C、瓣口面积
D、瓣口流速
E、瓣口流速时间积分
第6题
A.主动脉瓣平均跨瓣压差<40mmHg
B.主动脉瓣瓣口峰值流速<3.5m/s
C.左室流出道与主动脉流速比值>0.5
D.主动脉瓣瓣口面积<1.0cm2
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