多项选择题

以下何种情况不属于完善成像
A、平面波经光学系统仍为平面波
B、平面波经光学系统变成球面波
C、球面波经光学系统变成非球面波
D、球面波经光学系统变成平面波
E、非球面波经光学系统变成平面波

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单项选择题

Prof. Hoffmann said that the early Americans needed to fight sort of on the ground, so they established the US Army first. Then, the second oldest branch, some would say the oldest, but the second oldest branch is _____________, since they didn’t just fight on land.

A．the US Air Force
B．the US Marine Corps
C．the US Navy
D．the US Coast Guard

单项选择题

听录音并选择正确答案。

A、+40811 3587490
B、+40112 3854790
C、+14113 3584719