荧光比色法测定维生素C的激发波长为()。
A、345nm
B、365nm
C、400nm
D、430nm
参考答案:B
—Will you go there with your parents?
—____, I will stay at home and prepare for my language tests.
A.Not at all
B.Not exactly
C.Not nearly
D.Not likely
热镀条件下,由于潮湿引起板面腐蚀形成()。
A.钝化斑
B.白锈
C.氧化色
D.欠酸洗