你能帮帮他们吗
托运水瓶胆350箱,每箱装6个.合同规定每箱运费10元,如果损坏一箱,不给运费并赔偿损失50元.结算时,共得运费3200
1年前
对于氮气和氢气制氨气这一可逆反应,当氮气和氢气和氨气分子数之比为1:3:2时平衡了没?
1年前
Mary has been ill in bed for a week.I wonder is she is _____
1年前
把一块铝片的表面用砂纸磨干净,将下半片浸入浓硫酸,片刻后取出,用蒸馏水冲洗掉残留的酸后,再将整块铝片浸入硫酸铜溶液中,过
1年前
they went to play tennis after they finished their homework的
1年前