电动机的功率大小与接电持续率JC％值相对应，同一型号的电动机，随着JC％值的增大其功率逐级减小。
参考答案：对
At last the boy had no choice but ________ the bread from the supermarket. [ ]
A. admit to have stolen
B. admit having stolen
C. to admit to have stolen
D. to admit having stolen
一位50岁男性，无症状性血尿，首先应考虑（）
A.膀胱炎
B.膀胱结核
C.前列腺增生
D.肾结石
E.膀胱癌
