焊接接头的金相试验包括（）。
A、宏观金相试验
B、微观金相试验
C、机械性试验
参考答案：A, B
Fifty-three thousand shouting enthusiasts filled the stadium; they had come to watch the first game of the season and to cheer the home team.
A．enthusiasts filled the stadium to comeB．enthusiasts, filling the stadium, had comeC．enthusiasts filled the stadium; and had comeD．enthusiasts filling the stadium, who had come
下图表示胰岛素分泌的调节过程及胰岛素作用机理。请据图回答下列问题：
图中胰高血糖素对胰岛B细胞产生胰岛素的作用是（）。（填“促进”或“抑制”）
