不要用钢丝擦清洗铝部件钢丝擦会损害铝部件的()
A.表面光洁度
B.强度
C.氧极化层
D.表面硬度
参考答案:C
You were stupid to try climbing up there. You ______ yourself.
A.can kill
B.might have killed
C.might kill
D.must have killed
尺寸线不能用其他图线代替,但可以与其他图线重合或画在其延长线上。