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单项选择题

希尔方程描述了骨骼肌收缩时力一速度关系，张力愈大，速度愈小，反之亦然。（     ）

A．对
B．错

问答题

June, 20, 2020
I am writing this letter to __________[填空1]（投诉）the quality of the phone I bought last Tuesday in No. 1 Department store. The phone always________________[填空2]（黑屏）. I called the ______________[填空3](售后)， but the problem was not solved. Therefore, I have sent back the phone and the receipt to you and strongly insist that you ________________[填空4](退回我5000元) as soon as possible.
 I would be         [填空5]（感激的） if you could have this matter settled.