致生理盲点扩大的疾病不包括()
A.黄斑裂孔
B.视盘缺损
C.高度近视
D.有髓神经纤维
E.视盘水肿
参考答案:A
Simon is very confident. He isn’t afraid of ______ in the whole school.
A.make a speech
B.making a speech
C.makes a speech
D.made a speech
简述管线法兰泄漏的处理。