Her favourite food is fish (对画线部分提问)
____ her favourite food?
1.23×9+0.04=11.11
12.34×9+0.05=111.11
123.45×9+0.06=1111.11
____×9+____=____
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____.