应答器组中，以列车反运行方向为参照，列车首先经过的应答器编号为①
参考答案：错
下列各图能说明分子间的间隔变小的是[ ]
A.
B.
C.
D.
Modern computers are electronic and (8) devices. The basic building block of a modem computer is a (9) .
A) chemicalB) digital C) phisical D) anal0g
