材料受外力作用而不破被坏或不能改变它本身形状的能力叫（）。
参考答案：强度
There has been an increase in the technical cooperation and cultural________ between China and
other countries in the past ten years.[ ]
A. change
B. trade
C. bargain
D. exchange
破伤风之发病属（）
A.卒发
B.伏而后发
C.徐发
D.继发
E.复发
ncrease in the technical cooperation and cultural________ between China and