Harry and Julia met on a charity ball. After the ball, Harry sent a friend request to Julia. Yet Julia didn’t know who sent this message and she declined his friends request. What should Harry do?
A.
Send the friend request again and tell Julia who he is this time.
B.
Feel depressed and hold a grudge against Julia.
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【简答题】某液压泵的排量为 200mL/r ,转速为 1450r/min ,液压泵的输出压力为 10MPa ,容积效率 η v =0.95 ,总效率 η =0.9 ,试求:( 1 )液压泵的输出功率是多少?( 2 )电动机的驱动功率是多少?