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【单选题】
维生素B12缺乏引起的贫血不宜用叶酸治疗，理由是：（）A.
可加重神经系统病变
B.
不能使贫血好转
C.
叶酸和维生素B12在体内有拮抗作用
D.
叶酸可导致再障
E.
叶酸容易导致低血钾
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皮皮学刷刷变学霸
举一反三
【简答题】An acid reacts with a base to produce a salt and water. Hydrogen from the acid combines with ( ) from the base to form water molecules.
【单选题】Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g) In an experiment, 201 mL of wet H2 is collected over water at 27 °C and a barometric pressure of ...
A.
0.929
B.
706
C.
0.964
D.
760
E.
1
【简答题】An acid reacts with a base to produce a ( ) and water. Hydrogen from the acid combines with hydroxide from the base to form water molecules.
【单选题】使用“()”菜单命令可以对图像的色彩、亮度和对比度进行调整，而“色阶”菜单命令则只能调整图像的暗调、中间调和亮度。
A.
曲线
B.
自动色阶
C.
色彩平衡
D.
色相/饱和度
【单选题】-I don't feel like going out. Why don't we stay at home and watch TV? - _________ You promised to take me out for a ride. [ ]
A.
Really?
B.
Not at all.
C.
Come on !
D.
No matter.
【单选题】—I don't feel like going out. Why don't we watch TV at home? — ______ You promised to take me out for dinner.
A.
Come on!
B.
Really?
C.
Not at all.
D.
Why not?
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