当()时,大气处于稳定状态
A、γd﹥γ
B、γd﹤γ
C、γd=γ
D、以上都不是。
参考答案:A
—May I listen to the music here, Mr.White?
—Sorry, you'd better ________ it like that. [ ]
A. not to do
B. not do
C. don't do
D. not do to
A.晶体未研成粉末
B.坩埚未干燥
C.加热过程中晶体爆溅
D.加热时间过长,部分变黑