题目内容

单选Special cells, ____, in the epidermis produce the black pigment that gives color to the skin and protects against damage from the ultraviolet rays of the sun

A. leukocytes
B. erythrocytes
C. phagocytes
D. melanocytes

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单选Adipose tissue mainly exists in ______

A. epidermis
B. dermis
C. subcutaneous layer
D. corium

单选Which of the following is not the accessory structure of the skin? ( )

A. sebum
B. sweat gland
C. hair
D. nail

单选 ___ protrudes into the hair bulb and provides nutrients for the growing hair

A. Hair root
B. Hair follicle
C. Hair papilla
D. Arrector pili muscle

下列程序运行后得到的图形是（）。[x,y]=meshgrid(-2:2);z=x+y;i=find(abs(x)<1 & abs(y)<1);z(i)=NaN;surf(x,y,z);

A. 在一个正方形的正中心挖掉了一个小的正方形
B. 在一个正方形的正中心挖掉了一个小的长方形
C. 在一个正方形的上端挖掉了一个小的正方形
D. 在一个正方形的下端挖掉了一个小的正方形