电弧中气体介质的电离势（）时，电弧温度就（）。
参考答案：高（低）、高（低）
— Doctor, it seems to me ______ you like to work with animals.
— Yes. I think animals should ______ as our friends. [ ]
A. that; regard
B. that; be regarded
C. what; regard
D. it; be regarded
某一呈香物质其含量为1470mg／l，香味强度为82.2，请问该物质的阈值是多少？（）
A.15.9mg／l
B.16.9mg／l
C.17.9mg／l
D.18.9mg／l
