What’s your favorite ____ ? —Beijing.
A. subject B. book C. city
答案:C
Beijing是一个城市名,故选城市答案C。
There ________some juice and some cakes on the table. [ ]
A.is
B.are
C.am
D.be
A.时刻t线圈中电流的瞬时值icosωt
B.线圈中电流的有效值I
C.线圈中电流的有效值I=
D.线圈消耗的电功率P