A:lie a new built bridge
B:lies a newly built bridge
C:a new built bridge lie
D:a newly built bridge lie
吊车以2m/s的速度将重物1×105N匀速向上提起,这时钢索对重物的拉力是____N; 若钢索改为以3m/s的速度使重物匀速下降,此时钢索对重物的拉力大小是____N,方向____.