题干

Fe(OH)2很不稳定,露置在空气中容易被氧化,为了获得白色的Fe(OH)2沉淀,可以用不含Fe3+的FeSO4溶液与用不含O2的蒸馏水配制的NaOH溶液反应制备.

(1)除去蒸馏水中溶解的O2常采用____ 的方法.

(2)生成白色Fe(OH)2沉淀的操作是用长滴管吸取不含O2的NaOH溶液,插入FeSO4溶液液面下,再挤出NaOH溶液,这样操作的理由是____ 

(3)检验Fe3+存在的最佳试剂是____ ,现象是____ .

(4)写出Fe与H20在一定条件下反应的化学方程式 ____ .Fe(OH)2被氧化的化学方程为:____ .

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    The four theme parks below offer the most thrilling(刺激的)rides and attractions in the world.

Busch Gardens Williamsburg

    Located(坐落)in Virginia, USA, this theme paprk has some of the highest-rated thrill rides in the world. The park's famous roller coasters include Apollo's Chariot, Alpengeist, Griffon, the Loch Ness Monster and Verbolten. The park also has thrilling water rides, rides for kids, other rides, shows, tours, animal exhibits and more. Divided into nine areas representing European countries, the park has won an award for the quality of its food.

Everland

    One of the world's most popular theme parks, Everland is located in Yongin, Gyeonggi-do province, South Korea. The park has 40 thrill rides, including a world-famous wooden roller coaster, and many other attractions such as an hunting ride, a zoo, indoor and outdoor water parks, shows and more.

Blackpool Pleasure Beach

    This Lancashire amusement park is one of the most visited theme parks in the United Kingdom. Among the park's 125 rides and attractions are the tallest and faster roller coaster in the U. K., a classic wooden roller coaster, a steel tower ride, the biggest indoor dark ride in the world, a host of rides for kids and more.

PortAventura World

    Located on Spain's Costa Daurada, this park is divided into six themed areas. Five areas represent different locations including Polynesia, Mexico, the American West, China and the Mediterrancan. The sixth and newest area has a Sesame Street theme. The park has many rides and attractions suitable for visitors of all ages.