阴离子型表面活性剂:常用的()、烷基磺酸钠、烷基苯磺酸钠等,就属于这一类。
参考答案:肥皂
We tried to find a table for seven, but they were all ______.
A.given away
B.kept away
C.taken up
D.used up
为了提高观片效果,观片室环境亮度应与()相同。