【单选题】如果关于x的方程 正实数解有且仅有一个,那么实数a的取值范围为 [ ]
【单选题】In conclusion, the author emphasizes the fact that ( ).
A.
he owes much of his success in career to his family's good name
B.
he always look up to the family's good reputation as treasures inherited from his parents
C.
he and his children always cherish the family's good name and try hard to live up to it
D.
he is still held in respect when he is back in his hometown
【单选题】对于实数 a , b ,如果 a > 0 , b < 0 且 |a| < |b| ,那么下列等式成立的是( )
【简答题】电动汽车蓄电池的充电方法可以分为 充电方法和 充电方法。
【简答题】蓄电池的充电方法有哪3 种?根据充电目的不同,蓄电池的充电作业又有哪 3类?(6 分)
【单选题】某产品的单位销售价格为8元,其中变动费用为5元,年销售额为8元,问该产品的固定费用不能多于多少?
【多选题】按金融交易的程序划分,金融市场可分为( )。