【多选题】关于普通球面波与高斯光束的异同点,下列说法正确的是:
A.
前者的R(z)与后者的q参数含义不同,但变化规律相同
B.
R(z)是波阵面的曲率半径,而q称为高斯光束的复曲率半径
C.
若采用一个焦距为F的透镜对这两种光成像,其成像结果是相同的
D.
前者仅用R(z)就能描绘其光的结构,而后者需同时用R(z)和W(z)
【单选题】Your father’s grandparents are your ______.
【单选题】--Mom, where is the map? --It’s in your ___________ room
【单选题】护士配合医生进行心包穿刺时,正确的是(2013)
【单选题】Why was Danny shocked after his grandparents died?
A.
Because his grandparents didn’t teach him anything.
B.
Because his grandparents had a secret he didn’t know.
C.
Because his grandfather was good at writing a report.
D.
Because his grandfather’s life had been very interesting.
【单选题】Why was Danny shocked after his grandparents died?
A.
Because his grandparents didn’t teach him anything.
B.
Because his grandparents had a secret he didn’t know.
C.
Because his grandfather's life had been very interesting.
D.
Because his grandfather was good at writing a report.
【简答题】句型转换(5%) 小题1:These are my grandparents. (变一般疑问句) _______ these ______ grandparents? 小题2:Is this his picture? (作肯定回答) _______, ______ is. 小题3:The tape player is in the room . (对划线部分提问) _______ ________...