细集料的表观密度试验，以两次平行试验结果的算术平均值作为测定值，如两次结果之差值大于0.01g/cma，应重新取样进行试验。()
查看答案
相对密度是砂紧密程度的指标。()
A. 正确
B. 错误
What might be the most suitable title for the passage？
A Dentist's Work
B. Psychological Problems
C. Fears in Childbirth
D. Psychological Factors in Pain Endurance
Which of the following is not true according to the text？
A. The British dental service needs improving.
B. Psychological factors are the unique reason for pain.
C. Pain can be reduced if you know you can end it.
Dentists should be more considerate.
What might the phrase "on the other side of the coin" in paragraph one mean？
A. In other words.
B. On the other hand.
C. On the other side.
D. As the only complement to this.
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