公路是一种()工程构造物。
A、平面型
B、线型
参考答案:B
罪犯群体动力主要由()、()和()构成。
Which of the following nutritional deficiencies may delay wound healing()
A. Lack of thiamine.
B. Lack of vitamin C.
C. Lack of folate.
D. Lack of vitamin A.