What is important when preparing for an exhibition? Please specify the reason!
要参加展览会时，应注重什么？请说明原因！
If you answered "no" to Question 15, is the safety problem be the main reason? If not, please specify.
如果你在问题15回答“不会”，安全问题是否主要原因？如不是，请说明原因。
If you answered "no" to Question 15, is the safety problem be the main reason? If not, please specify.
如果你在问题15回答“不会”，安全问题是否主要原因？如不是，请说明原因。
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