脑血栓形成的“超早期”治疗时间一般是指发病后的（）
A.1小时内
B.3小时内
C.6小时内
D.12小时内
E.24小时内
参考答案：C
——________?
——Father’s Day is coming. I’d like to buy a present for my father.
A．How much would you like
B．What can I do for you
C．What colour do you want
D．What size would you like?
柱形磨鞋的焊接接头及下部锥体时，必须预热至（）以上，方能进行焊接。
A.200℃
B.300℃
C.400℃
D.500℃
