澳大利亚为什么又被称做“骑在羊背上”和“坐在矿车里”的国家？
全角状态下，一个英文符在屏幕上的宽度是（）。 ["1个ASCII字符","2个ASCII字符","3个ASCII字符","4个ASCII字符"]
认可机构委托他人完成与认可有关的具体评审业务的，由（）对评审结论负责。 ["认可机构","被委托人","认可机构的评审员","被委托人的评审员"]
老子学说辩证法的特点是（）。 ["无为而治的思想，无为无不为","无欲则刚，有容乃大","有无相生，难易相成，长短相形，高下相倾","阴胜阳，下胜上","以静制动，以柔弱胜刚强"]
As soon as you hear the fire and emergency signal, you should ensure that the （）. ["ring buoys are thrown overboard","engines are stopped","fire pumps are started","life preservers have been issued to everyone"]
澳大利亚的经济有哪些基本特征？
