A:will be take
B:are take
C:were take
D:had been take
—It's his key.
若式子x-12在实数范围内有意义,则x的取值范围是( )
____ ____ ____ ____(够,不够)
给一艘轮船装货,已经完成了76%,已经装船的货物与货物总量的比是____ :____ 。