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【单选题】
下列变化过程的焓变属于可逆相变焓是:
A.
1mol水在100℃在一个较大的密闭的容器中蒸发为水蒸气
B.
1mol水在室温下,在一个大气压下蒸发为水蒸气
C.
1mol水在0℃, 在一个大气压下凝固为冰
D.
以上都不是
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【单选题】Efforts were made by the government to stop the protest, but __.
A.
in person
B.
in effect
C.
in hand
D.
in vain
【单选题】渐变焦镜片提供自无限远至近点连续全程的清晰视觉,缺点是具有( )。
A.
焦外区
B.
像跳现象
C.
不够美观
D.
像差区
【单选题】下面的单位,( )多用于文字的大小。
A.
dp
B.
px
C.
dip
D.
sp
【单选题】渐变焦镜片提供自无限远至近点连续全程的清晰视觉,缺点是具有( )。
A.
焦外区
B.
像跳现象
C.
不够美观
D.
像散区
【判断题】渐变焦镜片提供自无限远至近点连续全程的清晰视觉。
A.
正确
B.
错误
【简答题】In the long history of the Chinese tea ceremony, efforts were made by Chinese people to make tea drinking experience more enjoyable. For example, they have formulated very vivid and yet artistic expre...
【单选题】渐变焦镜片提供自无限远至近点连续全程的清晰视觉,缺点是具有( )。
A.
焦外区
B.
像跳现象
C.
不够美观
D.
像散区 多选题
【单选题】The first systematic efforts to teach people to read and to write were made from approximately ______.
A.
3000 to 4000 BC
B.
1000 to 2000 BC
C.
300 to 400 BC
D.
4000 to 5000 BC
【简答题】The producers of instant coffee found their product strongly resisted in the market places despite their product's obvious advantages. Furthermore, the advertising expenditure for instant coffee was f...
【判断题】将化合物 ( R )-2- 羟基丙酸 用 Fischer 投影式表示
A.
正确
B.
错误
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