六氟化硫(SF6)是一种()的惰性气体,化学性能稳定,有优良的灭弧和绝缘性能。()
A、无色
B、无嗅
C、比重比空气小
D、无毒
E、不可燃
参考答案:A, B, D, E
It was ___ the quality of life in the future ___ I took this training course, not just to make more money.
A.to improve; that
B.improving ; when
C.to improve; when
D.improving ; that
以下有关优先级的比较,正确的是( )。
A. Component
B. Container
C. Swing
D. JApplet