以下不是岩层的产状要素的是()。
A.走向
B.倾向
C.向斜
D.倾角
参考答案:C
When a pencil is partly in a glass of water, it looks as if it ______.
A.breaks
B.has broken
C.were broken
D.had been broken
低碳钢的含碳量C为()。
A.C≤0.25%
B.0.25-0.6%
C.0.70%-1.20%
D.0.3-0.8%