澳大利亚的矿藏分布特点及其与地质构造的关系如何?
从事货物批发或零售的纳税人,年应税销售额在()以下的企业,是小规模纳税人。 ["100万元","150万元","180万元","200万元"]
An oceangoing ship of 400 gross tons and above must be fitted with a standard discharge shore connectionWhat is the size of the bolt circle diameter of the shore connection required to transfer oily ballast to a shore side reception facility?() ["125 mm","183 mm","215 mm","It depends on outside pipe diameter"]
合金的流动性与充型能力有何关系?为什么共晶成分的金属流动性比较好?
铁壳开关的文字符号为() ["QS","FR","FU","KR"]
澳大利亚的地形有何特征?在地形结构上与南、北美洲有何异同点?