【单选题】听力原文:W: Interested in this book? This is our best seller this week. M: Best seller? I am considering what new ideas it gives about how to deal with the aggravating people. W: It asks people to quit co...
A.
Many of her books are bestsellers.
B.
She is a shrewd bookstore owner.
C.
She is promoting her book in person.
D.
She is a salesperson at the bookstore.
【单选题】The Chinese Embassy in New Zealand has _____that 23 Chinese students in South Island city of Christchurch still went missing in the 6.3 magnitude earthquake.
【单选题】A fault line runs the length of New Zealand, which means that it often has ______.
【单选题】下列各项中,( )是经济净现值的表达式。
【判断题】1998年10月30日10寸左右,X公司设备二队铆工班孙X和起重班苏X在结构厂=车间北侧露天平台预制方炉钢结构产柱(600号H钢,长24.04mm),在柱子翻面后吊起摆正过程中(吊起高度240mm),焊工李X和铆工孙X站在柱子西端外侧扶着柱子,李X站在南面,孙X站在北面。柱子吊起后受扭力作用西端向南转动,孙X将李X推开,跨到柱子南面内侧试图将柱子稳住,但由于柱子惯性较大,西端撞在南侧别一根摆放的柱...
【简答题】全世界每年被腐蚀损耗的钢铁量非常惊人,在潮湿空气中发生吸氧腐蚀是钢铁腐蚀的主要原因。 (1)在潮湿空气中,钢铁发生吸氧腐蚀时的负极反应的电极反应式为 。 (2)已知草酸(H 2 C 2 O 4 )分解的化学方程式为:H 2 C 2 O 4 CO↑ + CO 2 ↑ + H 2 O,下列装置中,可用作草酸分解制取气体的是 (填答案编号)。 (3)某实验小组为测定铁锈样品的组成(假定铁锈中只有Fe 2...
【简答题】铁及其化合物在日常生活应用广泛,请根据下列实验回答问题: (1)钢铁的腐蚀 钢铁在潮湿的空气中被腐蚀的负极反应式为:______;将经过酸洗除锈的铁钉,用饱和食盐水浸泡后,放入如图所示装置中,下列叙述正确的是______ A.过一段时间,乙试管中的导管内水柱上升 B.甲试管中铁钉发生了化学腐蚀 C.铁钉在该装置中被腐蚀的情况随时间的延长而加快 (2)生铁中含有一种铁碳化合物X( Fe 3 C). ...