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【单选题】
龋病的形成与下列哪些因素有关A.
变形链球菌是主要的致病菌
B.
血链球菌与唾液链球菌也与龋病有关
C.
根面龋与粘性放线菌有关
D.
牙菌斑中的细菌代谢蔗糖产生酸性产物
E.
以上全部都是
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皮皮学刷刷变学霸
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【简答题】简述国际铁路货物联运单的组成和作用。
【简答题】简述国际铁路货协运单的作用及运单的组成、每联作用。
【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】In the 1960 South America tsunami, when the third wave came, it reached the height of ______.
【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
【简答题】黄瓜苗期易发生的主要问题有：寒根、（）、烧根、闪苗、烤苗、（）、花打顶等。
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