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钛具有硬度大、密度小、熔点高、抗腐蚀性远优于不锈钢等优良性能，被誉为“未来金属”．地球表面富含钛铁矿石，钛铁矿石的主要成分是FeTiO 3 ． （1） 已知FeTiO 3 中钛的化合价为+4价，则铁的化合价为______． （2） 冶炼金属钛时，将铁铁矿石转化为下TiCl 4 ，TiCl 4 再与Na在一定条件下反应生成Ti和NaCl．请写出后一步反应的化学方程式：______（不要求标出反应条件），其反应类型是______． （3）钛易生锈，请写出防止铁生锈的一种方法：______．
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举一反三
【单选题】根据《药品注册管理办法》，申请人拟在进口药品批准证明文件有效期期满后继续进口该药品的注册申请属于( )
A.
仿制药申请
B.
再注册申请
C.
进口药品申请
D.
补充申请
【单选题】What's the main idea of Para. 3 ?
A.
The difficulties that some organizers meet this year.
B.
Some organizers this year are very happy.
C.
This year major networks will advertise Buy Nothing Day.
D.
Over one million people join in the Buy Nothing Day this year.
【单选题】ParaIII 1. Whyare some organizers upset this year?
A.
Because a lot of people don’t support.
B.
Because a few people join the movement.
C.
Because major TV networks will not give them air time to advertise Buy NothingDay.
【简答题】Some organizers this year are _____ because major TV networks will not give them air time to advertise Buy Nothing Day. Despite ___ _________ of advertising this , over one million people in __ _...
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