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【单选题】
两个物体间相互作用的一对力,总是大小相等、方向相反、作用线相同,并分别而且同时作用于这两个物体上 。这是( )。A.
二力平衡公理
B.
加减平衡力系公理
C.
力的可传性原理
D.
作用力与反作用力公理
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举一反三
【单选题】What is the purpose of a c lock?
A.
To keep out boats that are too large for the c.
B.
To measure the tonnage of c boats.
C.
To load and unload the cargo.
D.
To change the depth of the water.
【单选题】The optic disc
A.
located in the bland part of the retina
B.
is formed by the optic nerve pierces the retina
C.
is sensitive to the light
D.
fovea centralis is its center
【简答题】水沟系 c system
【单选题】S1: How many important Cs are there all over the world? S2: Two biggest cs: Panama C, and Suez C. Q: Which C is there in America? 0102dh107
A.
Suez C.
B.
Panama C.
C.
Panama and Suez C.
D.
Americal C.
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