下列选项中属于投影变换的是()
A. 平行投影
B. 垂直投影
C. 水平投影
D. 透视投影
There was a huge bang as if someone had ___________ a rocket outside.。
A. explode
B. exploded
C. exploding
D. explodes
Bomb disposal experts ____________ the device under controlled conditions.
A. exploded
B. exploding
C. are exploded
D. are exploding
My dream is to _______ to a villa in France.
A. retire
B. retires
C. retired
D. retiring