下列哪一项不属于零件的机械修复（）。
A.修理尺寸法
B.镶装零件法
C.焊接修复
D.热扣合法
参考答案：C
—Peter，is there anything else you want to know about China?
—Yes，I am still wondering __________ .
A．how is Chinese paper cut made
B．how was the Great Wall built in ancient times
C．why the Chinese people like to play the dragon dance
D．why do the Chinese people eat rice dumplings at Dragon Boat Festival
增加空速合成塔的氨净值将（）
A、升高
B、不变
C、降低
