烟酸的另外一个常用名是（）
A.抗坏血酸
B.抗脚气病因子
C.泛酸
D.尼克酸
E.生物素
参考答案：D
解析：烟酸也称作维生素玟或维生素PP、尼克酸。
根据句意及首字母提示完成单词。
1. There are many animals in the z______.
2. What o______ things can you see in the picture?
3. The old man is f______ to us. We love him very much.
4. The little girl is very s______. She hides (躲藏) behind her mother.
5. Tom never (从不) does his homework, he is very l______.
0.01级电压互感器在20％额定电压时的比值差应不大于（）。
A、±0.02％
B、±0.04％
C、±0.015％
D、±0.03％
