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【单选题】如图为一种服务型机器人,其额定功率为 48 W ,额定工作电压为 24 V 。机器人的锂电池容量为 20 A ·h 。则机器人 ( )
A.
额定工作电流为 20 A
B.
充满电后最长工作时间为 2 h
C.
电池充满电后总电量为 7.2 × 10 4 C
D.
以额定电流工作时每秒消耗能量为 20 J
【单选题】Ladies and gentlemen, welcome to Dalian, a famous summer resort ( 避暑胜地 ) and one of the best tourist cities in China. With clear sky, green mountains, blue seas, fine beaches, clean streets and lovely...
A.
comes in the best season.
B.
is here to join more tourists
C.
may not stand the heat here.
D.
is traveling back home.