The questionnaires were distributed to 668 families randomly in rural areas. The questions involve in the categories of the pesticides and frequencies of use and safeinterval period and so on.
随机抽取668名农户进行问卷调查，内容涉及施用农药的种类、频次、施药安全间隔期等。
2
Conclusion: Chaihu injection was safe and feasible when used suitable interval and frequency to dropping nose.
结论：柴胡注射液采用适宜的给药间隔和给药次数滴鼻是安全、可行的。
3
Compared with the old signal system, the (signal system of) quasi-moving block shortens the safe distance of inter-train tracking interval and improves railway passing capability.