熔接机熔接这种方法主要用于光纤接头的连接，目前多采用自动熔接机进行熔接，熔接机分单芯熔接机和（）两种。
参考答案：多芯熔接机
— I often walk home after school.
— ______. [ ]
A. So she is
B. So is she
C. So she does
D. So does she
婴幼儿常见的眼部恶性肿瘤是（）
A.脉络膜血管瘤
B.脉络膜黑色素瘤
C.视网膜母细胞瘤
D.视网膜血管瘤
E.外层渗出性视网膜病变（CoatsdiseasE.
