【简答题】氨是氮循环中的重要物质,氨的合成是目前普遍使用的人工固氮方法. (1)已知:H-H键能为436kJ?mol -1 ,N≡N键能为946kJ?mol -1 ,N-H键能为391kJ?mol -1 .写出合成氨反应的热化学方程式:______ (2)恒温下,往一个4L的密闭容器中充人5.2molH 2 和2molN 2 ,反应过程中对NH 3 的浓度进行检测,得到的数据如下表所示: 时间/min 5 ...
【多选题】患者男性,65岁。食欲减退伴右上腹不适1个月余。体检:体温37.0℃巩膜黄染,心肺(-),肝肋下2cm,质地稍硬,叩诊移动性浊音可疑。实验室检查:WBC5.2×10 9 /L,RBC3.8×10 12 /L,ESR36mm/h。该患者家住湖边。该患者的肝功能检测可能的状态有().
A.
TB45.6μmol/L,DB5.6μmol/L
F.
PA0.12g/L,TBA22.6μmol/L
【单选题】When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will ...
A.
pick up more of any increase in load
B.
pick up less of any increase in load
C.
share an equal amount of any increase in load
D.
drop an equal amount of any decrease in load
【判断题】The contract states “shipment in July”, indicating that the shipment period is from July 1st to July 31st.
【单选题】I’d like to __________ a single room from July 1st to July 6th.
【单选题】The Party was founded ______ July 1st 1921
【简答题】已知①25℃时,难溶电解质的溶度积常数:Ksp(CaC 2 O 4 )=2×10 -9 ,②25℃时,100 mL 0.4 mol·L -1 H 2 C 2 O 4 水溶液中,用KOH固体来调节溶液pH(忽略体积变化),得到H 2 C 2 O 4 、HC 2 O 4 - 、C 2 O 4 2- 三种微粒含量与溶液pH的变化关系如图所示。 请回答下列问题: (1) pH=5.2时,H 2 C 2 O...
【单选题】n December, 2014, the prime operating revenue of Company B was $500 000. At thesame time, its other operating revenue was $50 000 with $300 000 operating costs and $10 000other operating cost respecti...
【单选题】随着学校的管理规模不断扩大,学生数量急剧增加,有关学生的各种信息量也成倍增长。学籍档案管理工作则变得更加复杂,档案的完整性、安全性等问题也显得更加重要,日益引起学校管理层的关注,需要有关学籍档案管理系统系统来提高学籍管理工作的效率。因此,学籍档案管理系统的开发也正是为了适应学校对变化的学生信息进行管理。学校希望开发一个学籍档案管理系统来满足管理的需要。学籍档案管理系统在学校的管理系统中处于()。
【简答题】Listen and choose. ( )Beijing ( )Suzhou ( )by bus ( )by bike ( )July 1st ( )July 3rd ( )CDs ( )books ( )brother ...