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【单选题】
下列有关金属及其化合物的说法中，正确的是（ ） ①在人类对金属材料的使用过程中，性质活泼的金属单质最早被人们冶炼和使用 ②纯铁比生铁抗腐蚀性更强 ③单质铝在空气中比较耐腐蚀，所以铝是不活泼金属 ④向紫色石蕊试液中加入过量的Na 2 O 2 粉末，振荡，溶液变为蓝色并有气泡产生 ⑤青铜、不锈钢、硬铝都是合金 ⑥可通过焰色反应区分钾元素和钠元素 ⑦往FeCl 3 溶液中滴入KI—淀粉溶液，溶液变蓝色 ⑧铝粉和氧化镁粉末混合，高温能发生铝热反应A.
4句
B.
5句
C.
6句
D.
7句
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【单选题】What is the name of the street,which is the heart of London’s Chinatown?
A.
Gerrard Street
B.
Great Street
【简答题】大学生活有哪些特点?
【简答题】Together with the network layer,the transport layer is the heart of the protocol（ ）The network layer provides end-to-end（ ） delivery using datagrams or virtual circuits.The transport layer builds on t...
【单选题】put computers to practical business use, but below the surface it is the heart of an(22) - the kernel - that provides the technical wizardry to juggle multiple programs, connect to networks and store(...
A.
Databases
B.
Applications
C.
Drivers
D.
Games
【简答题】大学生活有哪些特点?
【单选题】What is the name of the street, which is the heart of London's Chinatown?
A.
That is Tabley Street.
B.
That is Main Street.
C.
That is Gerrard Street.
【单选题】_________ from Beijing to Paris!
A.
How long way it is
B.
What a long way is it
C.
How long way is it
D.
What a long way it is
【单选题】What is the name of the street, which is the heart of London’s Chinatown?
A.
Gerrard Street
B.
Tablet Street
【简答题】Paraphrase: ... what is the heart of a bird compared to the heart of a man?
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