方程(m-2)xm(m-3)+4+3mx-1=0是关于x的一元二次方程,则m= [ ]
A.1
B.1或2
C.2
D.-2或1
答案:A
第四节 短文改错(共10小题;每小题1分,满分10分)
Li Ming, who has been working as postman for 56. ____________
two years, always wears a suit of green uniforms. 57. ____________
He worked with care as well as with effort. He 58.____________
serves for the people heart and soul. Every day he 59. ____________
gets up early to deliver newspapers or magazines. 60. ____________
He is so careful and he has never been wrong. 61. ____________
One day he had to send a dead letter and it happened 62. ____________
to be raining hardly outside. But he set out immediately. 63. ____________
He had asked nearly everybody in the district after 64. ____________
he managed to hand letter to the right person. 65. ___________
某固定资产原值为10万元,预计净残值为1万元,使用年限为6年,按年数总额法计提折旧,则第3年应计提折旧额为( )元。
A.19420 B.25713 C.16423 D.12857