石油产品铜片腐蚀试验法中规定柴油.燃料油.车用汽油试验温度（），试验时间为（）。
参考答案：50土1℃；3h土5min
He says "hello" to his friends from ________ countries. [ ]
A. speak English
B. say English
C. English speak
D. English-speaking
