【单选题】相同温度下,体积均为0.5 L的两个恒容密闭容器中发生可逆反应: 2XY 2 (g) + Y 2 (g) 2XY 3 (g) △ H =- Q kJ·mol - 1 ( Q >0) 实验测得反应在起始、达到平衡时的有关数据如下表所示: 容器 编号 起始时各物质物质的量/mol 达平衡时体系能量的变化 XY 2 Y 2 XY 3 ① 2 1 0 放热 0.25 Q kJ ② 1.2 0.6 0....
B.
达到平衡时,两个容器中Y 2 的物质的量浓度均为1.5 mol·L - 1
C.
容器②中反应达到平衡时放出的热量为0.15 Q kJ
D.
若容器①的其他条件不变,恒压下通入稀有气体,则达到平衡时放出的热量小于0.25 Q kJ
【简答题】如果有一台压力表,其测量范围为0~10MPa,经校验得到下列数据 (1)分别求出该压力表正反行程的最大绝对误差值; (2)根据正反行程的最大绝对误差值,该压力表的精度等级应为多少; (3)求出该压力表的变差; (4)根据变差的大小,问该压力表是否还能符合(2)中确定的精度等级。 (我国规定的仪表等级有0.1,0.2,0.4,0.5,1.0,1.5,2.5等)
【简答题】The newborn was 34 weeks' gestation. The birth weight is 2800g.
the fetal heart is slow, the fetal movement is reduced, Ihe whole body
color is blue at the time of birth.The tension of the four limb...
【单选题】Which of the following is an example of the primary attribute of a product?
A.
The ability of a camera to take a picture.
B.
The design and form factor of a phone.
D.
The prestige associated with driving a car
E.
The eco-friendly functioning of a digital watch
【单选题】Which of the following about the coats of the eyeball is not right?
A.
The sclera is opaque and white in color
B.
the vascular coat contains blood vessels
C.
the vascular coat contains pigment cells
D.
Pupil is an opening in the middle of centre of choroid layer
E.
The ciliary muscles are involuntary
【简答题】The web allows for color, graphics, animation, and sound, all of which make the e-commerce a more entertaining and potentially informative experience.
【多选题】Which of the following are the features of Chinese food?
A.
Color, aroma and taste are significant.
B.
Sweet in the south, salty in the north, sour in the west and spicy in the east.
C.
Time and temperature play an important role in cooking.
D.
Taste mainly depends on the seasonings.
E.
All the meat are cut into large pieces.