Present gun barrels are made up of high-strength steel. This type of material possess the differential strength in tension and compression.
现代火炮身管多用高强度钢制造，这类材料在拉伸和压缩时的力学性能存在明显差异。
Present gun barrels are made up of high-strength steel. This type of material possess the differential strength in tension and compression.
现代火炮身管多用高强度钢制造，这类材料在拉伸和压缩时的力学性能存在明显差异。
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