题目

1. Nobody can go out of school on workday without the teachers’ ______(许可). 2. It is so wet there that the trees are extremely tall, some ____________ (量起来) over 90 meters. 3. He accepted the job without__________. (犹豫) 4.The hostess had the_____________(请柬) delivered a week before the party. 5. Read the __________(说明书) on the medicine thoroughly. 6. He thought his marketing plan was perfect, but _____________(正相反), it was not and it failed. 7. 有了科学的农业生产方法，他们的土地产量更高。 _______________ scientific farming methods, th氮化铝（化学式为AlN，其中Al为+3价）广泛应用于电子、陶瓷等工业领域．在一定条件下，AlN可通过反应：Al2O3+N2+3C 高温 . 2AlN+3CO合成．下列叙述正确的是（　　） A、上述反应中，N2是还原剂，Al2O3是氧化剂B、上述反应中，CO为还原产物，具有还原性C、上述反应中，每生成1 mol AlN需转移3 mol电子D、AlN的摩尔质量为41 g