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【单选题】
紫红色针状晶体，溶于乙醇，在强酸、强碱和光照情况下不稳定，在中性及微酸性条件下对热稳定。缺乏症为巨幼红细胞贫血症。这种维生素为（）。A.
维生素B1
B.
维生素B2
C.
维生素B6
D.
维生素B12
E.
维生素C
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【简答题】青海可可西里国家级自然保护区主要的保护对象是( )。 A大象 B老虎 C藏羚羊 D金丝猴
【单选题】Walk ______ the street, and then you will see the mall in front of you. [ ]
A.
through
B.
cross
C.
across
D.
over
【单选题】It doesn't matter____you fail the exam. Keep on studying hard, and then you will succeed in the end. [ ]
A.
before
B.
unless
C.
if
D.
until
【单选题】Drive straight ahead, and then you will see a ______ to the Shanghai—Nanjing Expressway.
A.
sign
B.
mark
C.
signal
D.
board
【单选题】Keep on going and never , and then you will succeed. [ ]
A.
look up
B.
bump into
C.
throw away
D.
give up
【简答题】阅读理解 When I was a girl of 16, I met a common boy who would make jokes at you and then you would run after him and his guys and beat them up(打闹). After that first meeting, we kept on meeting and beatin...
【单选题】Drive straight ahead, and then you will see a to the Hefei - Nanjing Expressway.
A.
sign
B.
mark
C.
signal
D.
board
【简答题】定义材料类Material,包含: 私有的成员变量名称、单价(String name; double price;) 为数据初始化赋值的构造方法(带参); 封装上述两个成员变量; 公有的成员方法得到所有信息(public String toString()),相当于用友好的方式打印上述属性。 定义木材类Wood,继承自材料类。包含: 私有的成员变量颜色(String col;) 为数据初始化赋值的...
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