承受内压作用的复合材料圆筒,沿环向与纵向应按如下哪种比例铺设纤维()?
A、0.5:1
B、1:1
C、2:1
D、1:2
参考答案:C
At the meeting they discussed three different _____ to the study of maths.
A.approaches
B.means
C.methods
D.ways