油浸式电力变压器、电抗器的绕组电阻试验中,无中性点引出的绕组,线间差别不应大于三相平均值的()。
A.1%
B.2%
C.3%
D.4%
参考答案:A
Don't worry. I've just sent an ambulance to you. They ____ be there any second. [ ]
A. could
B. might
C. would
D. should
气相色谱法测定空气中甲醇时,色谱定量使用外标单点定量法。