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【简答题】
实验室常用下列装置来制取氧气: (1)写出图中有标号仪器的名称:a 、b ; (2)用双氧水和二氧化锰来制取氧气时,可选用的发生装置是 ,收集装置可以是 (填序号); (3)用高锰酸钾制取氧气时,发生反应的化学方程式为 ; (4)实验室常用氯化铵固体与碱石灰固体共热来制取氨气。常温下NH 3 是一种无色、有刺激性气味的气体,密度比空气小。NH 3 极易溶于水,其水溶液呈碱性。 ①制取氨气反应的方程式:2NH 4 C1 + Ca(OH) 2 CaCl 2 + 2NH 3 ↑+ 2X。X的化学式为: , ②NH 3 是一种碱性气体,干燥时可以选用下列干燥剂中的 (填序号)。 A.固体氢氧化钠 B.浓硫酸 C.生右灰
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【单选题】Wave height
A.
A
B.
B
C.
C
D.
D
E.
E
F.
F
【单选题】The height that a wave will eventually achieve is a function of:
A.
the period of the wave
B.
the fetch
C.
the wind velocity
D.
the duration of the wind
E.
b, c, and d
【单选题】Wave height refers to the vertical distance from ______.
A.
trough to trough
B.
trough to crest
C.
crest to sea bottom
D.
crest to crest
【简答题】The wave ( ) is one-half of the wave height.
【简答题】In the 1960 South America tsunami, when the third wave came, it reached the height of ______.
【判断题】氧气不存在燃烧焓
A.
正确
B.
错误
【单选题】What is the significant wave height?
A.
The average wave height
B.
Average height of the top one third of the waves
C.
The height of the largest wave
D.
The average height of the seventh wave
【单选题】What is the height of an ocean wave?
A.
The same as the amplitude
B.
The point when the wave breaks
C.
The distance from crest to seabed
D.
The distance from trough to crest
【单选题】The height of a wave is the vertical distance().
A.
from the still water plane to the crest
B.
from the still water plane to the trough
C.
from crest to trough
D.
between water levels at one-quarter of the wave's length
【判断题】氧气不存在燃烧热。 ()
A.
正确
B.
错误
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