衡量流体粘体大小的物理量称为(),它可由()或()查到。
参考答案:粘度;实验测定;有关手册
---Where did you find the package?
---It was on the beach_________we were taking a walk.
A.where
B.that
C.when
D.which
当心脏房室瓣处于开放状态,而动脉瓣处于关闭状态时,心脏的状态是( )
A.心房收缩,心室舒张
B.心房舒张,心室收缩
C.心房、心室同时收缩
D.心房、心室同时舒张