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【多选题】
地球自转360的时间为_______ 。A.
恒星日
B.
24h
C.
23h56m04s
D.
24h50s
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【单选题】变异型心绞痛( )。
A.
冠状动脉粥样硬化狭窄＞75%
B.
冠状动脉痉挛
C.
冠状动脉内完全闭塞性血栓形成
D.
冠状动脉粥样硬化狭窄＜50%
E.
冠状动脉斑块破裂不完全性血栓形成
【简答题】Algae(水藻) are very plants. They grow in fresh water or salty water. Seaweed is algae that grow in salty water. Seaweed is red or brown in color. The Japanese people use these plants from the se...
【单选题】Historically algae has been used as food for people in coastal populations, but some species of ________ are now being grown commercially for food use. Sushi wrappers may be made from this algae.
A.
green algae
B.
dinoflagellates
C.
red algae
D.
stoneworts
E.
euglenophytes
【单选题】Researchers find it difficult to make algae produce hydrogen efficiently because __________. 查看材料
A.
removing the sulfate slows down hydrogen production
B.
it is hard to create an airfree environment
C.
it is expensive to remove the sulfate from the environment
D.
the algae's cells work slowly if there is no oxygen in the air
【单选题】No unicellular or colonial representatives of the _______________ algae have been found to date.
A.
green algae
B.
diatoms
C.
brown algae
D.
dinoflagellates
E.
euglenoids
【单选题】We can infer from the last two paragraphs that _________.
A.
public relations play an important role in the entertainment industry
B.
all practitioners in public relations are good at persuasion
C.
public relations are only popular in advanced countries
D.
public relations have not been heard of in developing countries
【单选题】According to the passage, how might the fungus benefit from its association with algae?
A.
he algae help provide it with necessary moisture.
B.
It consumes nutrients produced by algae.
C.
It is made less visible because of the algae's green color.
D.
The algae provide structural support.
【简答题】Algae(水藻) are very plants. They grow in fresh water or salty water. Seaweed is algae that grow in salty water. Most seaweed is red or brown in color. The Japanese people use this plant from th...
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