Sydney Tower
Address: 100 Market St, Sydney
Phone: 02 9333 9222
Fax: 02 9333 9203
Open time: 9:00 a.m. t0 10:30 p.m. (Saturdays to 11:30 pm)
Ticket: $60 (for an adult) $30 (for a child)
Website: www.sydneytower.com.au
How to get there: train to Town Hall Station and a short walk along Market Street
How to book tickets: by phone/fax or through the web
Attractions: Sydney’s best views are just the beginning! Sydney Tower takes you to the highest point
above Sydney for exciting 360° view of our beautiful city.

如图是某电热水壶加热和保温电路原理图，R₁=44Ω，R₂=440Ω，当开关S₁断开，S₂闭合，电热水壶处于____ 状态；该电热水壶的加热功率是____ W．

长期以来,我国矿产资源的流失颇为严重。2013年8月6日,国土资源部发出通知,将对我国矿产资源的“三率”(回采率、入选率、利用率)展开调查,汇总全国数据,提出矿山矿产资源合理开发利用评价体系,建立评价数据库。西北地区矿产资源丰富,下列矿产地与所产矿产搭配不正确的是(    )