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【简答题】
如 图所示,置于光滑水水平面上的物块受到两个水平力的作用.欲使该物块处于静止状态,需施加一个大小为 、方向向 的力
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反馈参考答案：
举一反三
【单选题】In assessing a patient with osteogenesis imperfecta, a history of bone fractures, as wel1 as blue sclerae, are noted. These findings are an example of
A.
allelic heterogeneity
B.
gain-of-function mutation
C.
locus heterogeneity
D.
multiple mutations
E.
pleiotropy
【单选题】Tom, where did you put the ______ cups?
A.
blue two coffee
B.
two blue coffee
C.
two coffee blue
D.
blue coffee two
【单选题】The cloth is ______.
A.
as blue as green
B.
bluer than green
C.
more blue than green
D.
so blue as green
【简答题】感光度和曝光量的关系是
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