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【简答题】
如图是传统的工业生产的基本流程图。 请回答： （1）常用来制造容器，但铝制餐具不宜用来蒸煮或长时间存放酸性、碱性等食物，写出铝与氢氧化钠溶液反应的离子方程式：_____________________________________。 石油炼制和煤的干馏产品________(填物质名称)作电解铝的阴极和阳极材料。 （2）在冶炼过程中，阳极材料需要定期进行更换，原因是该极材料不断被消耗，产生这种现象的原因是____________________________________(用化学方程式表示)。 （3）工业上通过电解熔融的MgCl 2 制取金属镁，电解反应方程式为________________。镁和铝都是活泼金属，为什么在电解冶炼过程中，一个用氯化物，一个用氧化物，请说明理由。________________________________________________。
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【简答题】能够独立向外电路提供电能的电源称为 电源 ,不能独立的向外电路提供电能的电源称为 。
【简答题】A．run through B．run over C．go on D．go through
【单选题】During the cardiac cycle of a normal healthy young adult:
A.
During the initial stage of ventricular contraction the volume of the ventricle does not change.
B.
During ventricular diastole the pressure in the left ventricle is close to 80 mm Hg (10.6 kPa).
C.
During ventricular systole, all the blood in the ventricles is ejected.
D.
At the end of ejection, the blood pressure reached the highest level.
【单选题】Kate was not sure_______.
A.
that she should go through the third gate
B.
if she should go through the third gate or not
C.
which gate should she go through
D.
which gate she should go through
【单选题】Kate was not sure _____. [ ]
A.
that she should go through the third gate
B.
if she should go through the third gate or not
C.
which gate should she go
D.
which gate she should go through
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