板卡类设备的金手指如果出现氧化，可以使用如下（）工具进行清洁。
A.海绵
B.棉球蘸丙烯醇
C.橡皮
D.除氧剂
参考答案：C
Michael Jordan and Yao Ming are both ______ NBA players. But I prefer Yao Ming though
Jordan became famous ______ than him. [ ]
A. successful; early
B. successfully; earlier
C. successful; earlier
D. successful; more early
什么叫“绿色照明”？
