问题
单项选择题
目前认为可用于一级参考测量方法的测量原理是()
A.同位素稀释/质谱
B.库仑法
C.重量法
D.滴定法
E.以上均正确
答案
参考答案：E
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目前认为可用于一级参考测量方法的测量原理是()
A.同位素稀释/质谱
B.库仑法
C.重量法
D.滴定法
E.以上均正确
参考答案：E
| 阅读短文，判断句子对(√)错(×)。 | |
Joe: Six apples, please. How much? Salesgirl: Four yuan. Robin: What are these? Salesgirl: They are watermelons. How many do you want? Robin: Only one, please. How much? Salesgirl: Ten yuan. Joe: Robin, look! These peaches (桃子) are nice. Salesgirl: How many do you want? Joe: Five, please. How much are they? Salesgirl: Seven yuan. Robin: What are these? Salesgirl: They're pineapples (菠萝). Do you want some? Robin: Yes. Two, please. How much? Salesgirl: Nine yuan. ( ) 1. Robin wants six apples. ( ) 2. One watermelon is ten yuan. ( ) 3. Joe wants five peaches. ( ) 4. Two pineapples cost (花费) nine yuan. ( ) 5. Six apples cost six yuan. ( ) 6. Robin wants six pineapples. |