问题
单项选择题
下列显影液的成分中,作为抑制剂的( )。
A.对苯二酚
B.溴化钾
C.硫代硫酸钠
D.亚硫酸钠
E.氢氧化钠
答案
参考答案:B
解析: 显影液的成分包括显影剂、加速剂、保护剂和抑制剂等。常用的抑制剂是溴化钾。
下列显影液的成分中,作为抑制剂的( )。
A.对苯二酚
B.溴化钾
C.硫代硫酸钠
D.亚硫酸钠
E.氢氧化钠
参考答案:B
解析: 显影液的成分包括显影剂、加速剂、保护剂和抑制剂等。常用的抑制剂是溴化钾。
阅读下面表格中的内容,从每题所给的A、B、C3个选项中,选出最佳选项。 | ||||
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1. If you want to take English classes, you should pay ______ an hour. | ||||
A. $8 B. $10 C. $18 | ||||
2. You want to work in a restaurant, so you should call ______. | ||||
A. Lisa B. John C. Sue | ||||
3. You can see a new play at Bay College Theatre at ______ on Saturday. | ||||
A. 8:00 p.m. B. 5:00 p.m. C. 9:00 p.m. | ||||
4. Dave worked in Center's Restaurant from Monday to Friday last week, 2 hours every night, so he could get ______ last week. | ||||
A. $8 B. $80 C. $16 | ||||
5. You can help the book sale every day except ______. | ||||
A. Sunday B. Monday C. Saturday |