A:a2
B:a2b2c2d2
C:a2b2c2d2
D:a2b2c2d2
一个花坛,直径5米,在它的周围有一条宽1米的环形小路,小路的面积是多少平方米?
The skin, an ________ part of your body and its largest organ, ________ as a barrier against diseases.
根据拼音写汉字
qù
měng
lù
面面相____
____懂
杀____
人的肝脏是属于哪个系统的器官( )