【简答题】Plese write a letter to say "Thank you" to someone. There should be more than 50 words. 根据模板写一封英文感谢信,要求不少于50字。
【单选题】Why has the number of camels in India been decreasing in recent years?
A.
Because they are dying from travelling too far.
B.
Because they are short of food.
C.
Because they are infected with a disease.
【单选题】乙烯催化氧化成乙醛可设计成如下图所示的燃料电池,能在制备乙醛的同时获得电能,其总反应为: 2CH 2 = CH 2 + O 2 → 2CH 3 CHO。 下列有关说法正确的是 ( ) A.该电池为可充电电池 B. 每有 0.1mol O 2 反应,则迁移 H + 0.4mol C.正极反应式为:CH 2 = CH 2 - 2e - + 2OH - = CH 3 CHO + H 2 O D. 电子...
【简答题】某设备上真空表的读数为 13 . 3 ×10 3 Pa, 试计算设备内的绝对压强与表压强。已知该地区大气压强为 98.7 ×10 3 Pa 。 2. 某流化床反应器上装有两个 U 型管压差计,如本题附图所示。测得 R 1 = 400 mm , R 2 = 50 mm ,指示液为水银。为防止水银蒸汽向空气中扩散,于右侧的 U 型管与大气连通的玻璃管内灌入一段水,其高度 R 3 = 50 mm 。试求...
【单选题】卫生洗手法,错误的一项是
B.
双手指尖朝下,低于手腕充分搓洗10~15min
D.
进行卫生手消毒,监测的细菌菌落总数应少于10/C㎡
【单选题】客户在A专营店购买了一台天籁车,出差到异地,在当地B专营店发现音响不工作(确认为质量问题,且在保修期内),此时B专营店应()
【单选题】蛟龙号载人潜水器的研发是什么时候开始启动的?()
【单选题】The tragic events on Sunday and Monday reveal ______ in Pakistan.
A.
the historic hatred between Sunni and Shiite Muslims
B.
there are sectarian terrorists among both Sunni and Shiite Muslims
C.
Sunni Muslims could never have good relations with Shiite Muslims
D.
Sunni Muslims would not allow Shiite Muslims to challenge their majority role