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【单选题】
下列数据中具有三位有效数字的是A.
某溶液浓度为 3.510 mol/L
B.
某溶液pH值为 2.86
C.
某容液体积为 0.050L
D.
某固体粉末质量为 5.56g
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【简答题】An old friend from abroad, whom I was expecting to stay with me, telephoned from the airport to tell me that he had arrived. I was still at the office at the time, but I had made arrangements for his ...
【单选题】p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Hiragino Kaku Gothic ProN'; color: #000000}span.s1 {font: 12.0px 'PingFang SC'}孔子周游列国长达几年？
A.
13
B.
14
C.
20
D.
22
【简答题】I was listening to the radio when you rang the bell for the first time, and that’s why I ______ you. (not hear)
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