大全987-55

windcolour

1.        According to United States Air Force officials, a cannon shooting dead chickens at airplanes has proved helpful to demonstrate what kind of damage can result when jets fly into a flock of large birds.

(A) shooting dead chickens at airplanes has proved helpful to demonstrate

(B) shooting dead chickens at airplanes has proved itself helpful as a demonstration of

(C) shooting dead chickens at airplanes proves itself helpful as demonstrating

(D) that shoots dead chickens at airplanes proves itself helpful to demonstrate（E）

(E) that shoots dead chickens at airplanes has proved helpful in demonstrating

谁能帮忙翻译一下"a cannon that shoots dead chickens at airplanes has proved helpful in demonstrating...."是什么意思啊

faroceaner

这是测试喷气式发动机稳定性的手段，因为叶片在高速旋转，如果有异物（比如鸟类）进入会引起爆炸，所以测试的时候就用特制的炮把死鸡，死麻雀发射到转动的发动机里，看看发动机能不能承受