氨区卸料区应尽可能设置在氨区围墙内，如受场地限制，卸料区只能设于氨区围墙外的，应在液氨万向充装系统周围设置（）。
参考答案：保护围栏
限寄规定是本着既照顾和方便客户的合法需要和正常往来，又限制投机倒把和走私违法行为而制定的。
With regard to payment for shares in the context of capital maintenance, explain the meaning and legal effect of the following:
(b) issuing shares at a discount. (5 marks)
