磁粉检测根据磁粉的施加可分为()。
A.永久磁铁法
B.干粉法
C.剩磁法
D.湿粉法
参考答案:C, D
I would appreciate it ________ you can help me with my English this afternoon. [ ]
A. because
B. until
C. when
D. if
书中所写,贾敬是怎么死的?