重氮化法中可用()试纸作外指示剂来确定终点。
A、淀粉-碘化钾
B、中性红
C、石蕊
D、酚酞
参考答案:A
(2013·安徽十校素质检测)His injuries are extremely serious,but he's expected to ________.
A.pull in
B.pull through
C.pull up
D.pull over
能引起电光性眼炎的是()
A.紫外线
B.红外线
C.高频电磁场
D.无线电波
E.微波