下一代iPhone将在电池方面有所改进,该电池的一极为一种有机高分子的游离基(用

题型:选择题

问题:

下一代iPhone将在电池方面有所改进,该电池的一极为一种有机高分子的游离基(用R表示)和石墨粉及粘结剂的复合物,另一极是锂,分隔材料为某种聚烯烃,电解质为LiPF6溶解于某种有机碳酸酯溶剂中。有机高分子游离基在空气中十分稳定,在电池充电时被氧化成阳离子,而电池放电时又被还原成游离基。下列有关说法不正确的是(    )

A.放电时,该电池是将化学能转化为电能

B.充电时,R—由阴极向阳极移动

C.放电时,负极发生的反应为Li-e-=Li+

D.充电时,阳极发生的反应为R-xe-=Rx-

考点:金属的电化学腐蚀
题型:选择题

同义句转换, 每空一词 ( 每空0.5分,共10分 )

小题1:Paris is situated on the River Seine and is known as a city of romance.

_____ _____ the River Seine, Paris is known as a city of romance.

小题2:It is known to all that the modern Olympic Games began in Athens, the capital of Greece.

_____ _____ _____ _____ _____, the modern Olympic Games began in Athens, the capital of Greece.

小题3:The style of Chinese buildings influenced the Japanese architecture greatly.

The style of Chinese buildings _____ _____ _____ _____ _____ the Japanese architecture

小题4:Gradually, the number increased during the second half of the twentieth century.

_____ _____ _____, the number increased during the second half of the twentieth century.

小题5:Compare the girl with many other women, and we find her very lucky.

_____ _____ many other women, the girl is very lucky.

小题6:The door opened and a man entered, followed by a group of soldiers.

The door opened and there _____ _____ _____, followed by a group of soldiers.

题型:选择题

洋地黄毒苷中洋地黄皂苷的检查

A.Kedde反应

B.Vitali反应

C.Keller-Kiliani反应

D.Marquis反应

E.坂口反应

题型:选择题

小明放学回家,看见水平茶几的中央放着一个盛有水的平底玻璃杯.如图所示,于是他利用家中的皮尺测得水深12cm,粗略测出玻璃杯的底面积为2×10﹣3m2;又估测出水和杯子的总质量约为0.4kg;请你解答下列问题.(g取10N/kg,ρ=1.0×103kg/m3

(1)水和杯子的总重力;

(2)水对杯底的压强;

(3)杯子对水平茶几的压强.

题型:选择题

炭疽的传染源为()

A.带菌者

B.猪和犬

C.患者

D.羊

E.牛

题型:选择题

单体的相对活性习惯上用()判定,自由基的相对活性习惯上用K12判定。在Q-e值判断共聚行为时,Q代表(),e代表()。

更多题库