直流发电机的功率等于电压与电流之和。()
参考答案:错
Chinese culture has become ________ interest for people all over the world since the Shanghai Expo and many foreigners are discovering ________ history of China.
A.the;/
B.an;the
C.an;/
D.the;the
下列描述的删除操作中,哪一个操作不正确
A.从student中删除行('010',‘王宏大’,'01','02')
B.从class中删除行('02',‘计算机’,‘张海’)
C.从class中删除行('03',‘英语’,‘李洪亮’)
D.先在student中删除行('010',‘王宏大’,'01','02'),然后从class中删除行('01',‘企业管理’,‘郑红霞’)