题目

 Jenkins stood at the huge plate glass window looking down at the parking lot．“You have to fire him．” “Who?”William sighed． “That Casey．” Jenkins was the firm’s regional manager，and his visits were monthly inspection on William’s entire team． “Casey? He’s my best salesman．You know，youth is a blunder(莽撞)，but when he calms down，he is so devoted to his work．Why should I fire him?”    Jenkins craned(伸长)his neck to follow whatever he was watching．“I don’t think he helps to build our company image well．” “Maybe not，but he’s r钢铁是使用最多的金属材料．（1）早在春秋战国时期，我国就开始生产和使用铁器．写出以赤铁矿（主要成分Fe2O3）为原料炼铁的化学方程式    （2）利用新技术能将不锈钢加工成柔软的金属丝，用它和棉纤维一起编织成性能优良的劳保防护服，这是利用了不锈钢的    （填序号）．A．耐腐蚀性B．延展性C．导热性D．导电性（3）市场上有一种含囫粉的麦片，食用后在胃酸作用下将铁粉转化为人体可吸收的铁元素，反应的化学方程式为    ．这种麦片必须真空保存，原因是    ．