脉搏波由左心室间断射血产生，沿动脉壁从中央向外周传导，遇到阻抗不匹配处可以发生反射。
A pulse wave is produced by intermittent left ventricular ejection, propagates from the centre to the periphery along the arterial tree, and can be reflected at the points of impedance mismatch.
助细胞合点端及侧方与卵细胞、中央细胞的共同壁不连续。
Its wall has discontinuous sites at the chalazal end and side wall sharing with the egg cell and the central cell.
实验研究结果表明：分子筛催化剂颗粒粒径的大小对壁面传热系数和总传热系数影响大，而对中央区的传热系数无影响。
Experimental results reveal that this diameter exerts strong influence to the overall heat transfer coefficients and that on the wall, but irrelevant to that in the central zone.
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