自承式蝶形引入光缆加强芯与S固定件缠绕后,应确保光缆加强芯分离处与S固定件的距离为()。
A、10-20cm
B、15-20cm
C、5-10cm
D、10-15cm
参考答案:D
I wonder why Mr. Wang did not attend the lecture. He _____ another one. [ ]
A. could have
B. must have
C. might have had
D. should have
美国“布什”号属于()航母?
A.布什级
B.尼米兹级
C.福特级
D.企业级