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【单选题】
两个相同高度的斜面倾角分别为 30° 、 60° ,两小球分别由斜面顶端以相同水平速率 v 水平抛出,如图所示,不计空气阻力,假设两球都能落在斜面上,则分别、右两侧 抛出的小球下落高度之比为A.
1:2
B.
1:9
C.
3:1
D.
9:1
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反馈参考答案：
举一反三
【单选题】( )is a translucent gelatinous substance between the cell membrane and the nucleus.
A.
cell wall
B.
Cytoplasm
C.
mitochondrion
D.
endoplasmic reticulum
【单选题】The genetic mateiral in the nucleus of the cell is called the ______.
A.
cytoplasm
B.
chromosome
C.
chromation
D.
gene
【单选题】According to it's function what best reflects the nature of the cell nucleus is ( )
A.
Associated with genetic variation in organisms;
B.
Related to the continuation of life
C.
The nucleus divides firstly when the cell and mitosis;
D.
The main place for DNA storage and replication
【简答题】下列选项属于阳证的是（ ）
【单选题】The genetic material in the nucleus of the cell is called the ______ .
A.
cytoplasm
B.
chromosome
C.
chromatin
D.
gene
【简答题】下列选项属于阳证的是（ ）
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