A.2倍 B.1倍 C.0.5倍 D.0.8倍
A.7% B.10% C.12% D.15%
A.無影響 B.變形越大,強(qiáng)度越低 C.變形越小,強(qiáng)度越低 D.變形越大,強(qiáng)度越高