澳大利亚东南部的墨累——达令河流域是澳大利亚重要的[ ]
A.粗放牧羊带
B.绵羊与小麦混合带
C.粗放牧牛带
D.羊、牛与经济作物经营带
B
()及以下变电站技改工程隐蔽工程验收由地市公司运检部选派相关专业技术人员参加。
A.35kV
B.110(66)kV
C.220kV
D.500(330)kV
The difference between international and national Navtex Service is limited to().
A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time