We often go to school _____________.[ ]
A. by the bike
B. by foot
C. by bike
答案:C
已知数列{an}的通项公式为an=4n-3,则a5的值是( )
A.9
B.13
C.17
D.21
A.副线圈输出交流电的频率为10Hz
B.交流电压表的示数为20V
C.电阻R上消耗的电功率为2kW
D.原线圈中电流的最大值为100A