____ with what the students had done, th

设m∈R，x∈R，比较x²-x+1与-2m²-2mx的大小．

a、b、c、m都是有理数，且a+2b+3c=m，a+b+2c=m，那么b与c的关系是[ ]

A．互为相反数

B．互为倒数

C．相等

D．无法确定

While it is essential that the text covers the subject adequately, it is also important that it is neither too detailed or too complex for the intended reader.

A．for

B．nor

C．no

D．not

下列各项，增值税一般纳税企业需要视同销售计算销项税的有( )。

A．自制产成品用于职工福利

B．自制产成品用于对外投资

C．委托加工的货物用于职工福利

D．外购的生产用原材料改用于自建厂房