A. s - s 重叠 B. py- py(或 pz-pz)重叠 C. s- px 重叠 D. px- px 重叠
A. 对 B. 错
A. will have been working B. would have been working C. will work D. would work
A.海军锚 B.马氏锚 C.霍尔锚 D.丹福锚