He is really quiet. He is a man of __words.
A. few
B. a few
C. little
D. a little
查看答案
After __years, the traditions are still upheld by the local people.
A. thousand
B. thousands
C. thousand of
D. thousands of
I couldn’t find words__him what I was feeling at the moment.
A. tell
B. to tell
C. telling
D. told
PO2电极属于（）
A.离子选择电极
B.金属电极
C.氧化还原电极
D.离子交换电极
E.玻璃电极
PO2电极使用时外加直流电压的范围是（）
A.0~0.2V
B.0.2~0.4V
C.0.4~0.8V
D.0.8~1.2V
E.1.2~1.6V
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