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问题 选择题

用石墨电极电解500mLNaNO3和Cu(NO3)2的混合溶液。通电一段时间后，阴、阳两极逸出的气体在标准状况下的体积分别为11.2L和8.4L，求原溶液中Cu2+的物质的量浓度（假设溶液的体积不变）                                                      [ ]

A．1.25 mol·L－1

B．2.5 mol·L－1

C．0.50 mol·L－1

D．1.0 mol·L－1

答案

答案：C

听力题

根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺。

Look at this picture. He 小题1:i___________ David. He loves sports. 小题2:H___________ likes basketball very much.

He is a 小题3:m___________ of his school basketball team. He often小题4:p___________ basketball with his friends after school. He is 小题5:g___________ at playing basketball. They often play 小题6:b___________ and watch basketball matches on TV.

David likes Yao Ming 小题7:v___________ much. 小题8:B___________ Yao Ming is his hero. David wants 小题9:t___________ be a good basketball player like Yao Ming.

小题10:D___________ you like sports? Can you tell me about your favourite sport?

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单项选择题

TADS（）预报故障轴承车辆的车号和故障轴位。

A、自动

B、手动查询

C、人工智能
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