多项选择题

下述措施中对提高换热器壳程对流传热系数有效的是（）。

A．增大板间距
B．换热器采用三角形排列
C．增加管程数
D．设置折流板

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单项选择题

容量血管是指

A．动脉
B．静脉
C．毛细血管
D．肺血管

单项选择题

What did Sarah do for a living? A.
She typed menu for a neighboring restaurant. B.
She worked as a waitress in a neighboring restaurant. C.
She worked as a cook in a neighboring restaurant.