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（课前测）喷灌系统按管道可移动程度分、、。
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（课前测）当相邻喷头同时喷洒时，各喷头湿润面积有一定重叠，这时的实际喷灌强度小于单喷头单独喷洒时的喷灌强度。
1. Studies have found that larger firms are much more prevalent users of corporate advertising than smaller firms.
2 Firms have found both internet and television to be well suited to corporate advertising.
3 Corporate advertising is always targeted at consumers.
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