常见的钢的淬火缺陷有哪些?
参考答案:
(1)氧化与脱碳
(2)过热与过烧
(3)变形与开裂
(4)硬度不足
(5)软点
小儿消食片多用于()
A.脾胃不和
B.消化不良
C.食欲不振
D.面黄肌瘦
E.大便不调
Can you explain ______ the OPEC can have such total control over the price of oil?
A.how is it that
B.that how
C.how it is that
D.what is it