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【单选题】
下列四个命题中的真命题是 [ ]A.
经过定点P 0 (x 0 ，y 0 )的直线都可以用方程y-y 0 =k(x-x 0 )表示
B.
经过任意两个不同点P 1 (x 1 ，y 1 )、P 2 (x 2 ，y 2 )的直线都可以用方程(y-y 1 )(x 2 -x 1 )=(x-x 1 )(y 2 -y 1 )表示
C.
不经过原点的直线都可以用方程 表示
D.
经过定点A(0，b)的直线都可以用方程y=kx+b表示
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皮皮学刷刷变学霸
举一反三
【单选题】The human body is incredibly __________. When you donate a pint of blood, you lose about 3.5 trillion red blood cells, but your body quickly replaces them.
A.
supple
B.
flexible
C.
strong
D.
resilient
【单选题】When red blood cells of blood group A meet serum of blood group B, the red blood cells will ( )
A.
aggregation
B.
adhere
C.
overlap
D.
agglutinate
E.
clot
【单选题】Red blood cells are not easily broken when they flow through narrow capillaries and sinuses. The main reason is that
A.
The red blood cells are in the shape of a double concave disc
B.
higher viscosity in red blood cells
C.
Better elasticity of red blood cell membrane
D.
Slow blood flow here
【简答题】Red blood cells are an exception since they have nonuclei___________.A. when mature B. when grown C. when produced D. when increased
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