安装镉镍碱性蓄电池组，配制和存放电解液应用（）器具。
参考答案：耐碱
JD-581多线电测仪的电压常数为m=12.5mv/cm时，标准电阻选为R=20Ω，测量时检流计光点偏转L=8cm，所测量电流是多少？
It just isn't fair I was working as a waiter last month, my friends were lying on the beach. [ ]
A. whenever
B. though
C. while
D. for
