异嗜性抗原是一类与种属特异性无关的，存在于人与动物、植物、微生物之间的交叉抗原。
参考答案：对
His health had_____ while he was in prison.
A．became better
B．became worse
C．became stronger
D．became weaker
请简述QTFJ型切缝机缝纫机，直针高度调整标准。
