Goods are carried by several        of transport--on road or rail, by sea or air.

You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

_____she comes or not makes no difference.

2002年新配方口服补液盐(ORS)溶液的张力是

一阶系统τ参数的量纲及其含义？

写出逻辑斯谛方程，并指出各参数的含义。

写出生物种群的指数增长模型及逻辑斯蒂增长模型，并分别介绍其生物学意义？

绘图题：如图E-11所示为锅炉炉膛熄火判别逻辑图，说明图中各逻辑门电路应为何种电路，并解释逻辑图的工作原理。