根据专业特点，多采用标准物质来进行量值传递和溯源的是（）。
A.电离辐射计量
B.声学计量
C.光学计量
D.化学计量
参考答案：D
用括号中所给单词的适当形式填空
小题1:They’re studying hard to prepare for the exam __________ (care).
小题2:There are many kinds of animals in __________( dangerous).
小题3:I think there will be more__________(pollute) and less water in the future.
小题4:— How often do you watch TV?
__________ (two) a week.
小题5:He feels __________ (comfortable) today than yesterday.
游客游览景区如何注意个人形象？
