在波分系统中,经常提到的DWDM的中文意思是密级波分复用;EDFA的中文意思是掺铒光纤放大器;OSNR的中文意思是光信噪比;ALS的中文意思是()。
参考答案:激光器自动关断
Do you know __________ at this time yesterday?[ ]
A. what she is cooking
B. what is she cooking
C. what she was cooking
D. what was she cooking
大肠癌好发于()。
A.直肠
B.乙状结肠
C.横结肠
D.升结肠
E.降结肠