较理想的疏水性基质是()。
A、凡士林
B、羊毛脂
C、蜂蜡
D、硅酮
参考答案:D
I have been convinced that the print media are usually more ____ and more reliable than television.
A.shallow
B.ridiculous
C.urgent
D.accurate
电力电缆做直流耐压试验时,绝缘中的电压是按电容分布的。