_____________ you like this village? [ ]
A. Are
B. Do
C. Is
答案:B
— How old is the Palace Museum?
— It's about __________ years old.[ ]
A. five hundred
B. five hundreds
C. five thousand
关于磁感强度,正确的说法是( )
A.根据定义式B=FIL,磁场中某点的磁感强度B与F成正比,与IL成反比
B.磁感强度B是矢量,方向与F的方向相同
C.B是矢量,方向与通过该点的磁感线的切线方向相同
D.在确定的磁场中,同一点的B是确定的,不同点的B可能不同,磁感线密的地方B大些,磁感线疏的地方B小些