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【单选题】
碳素钢,是指含碳量小于2.11%的铁碳合金,按照含碳量的不同,分为低碳钢,中碳钢和高碳钢,对于工具或弹簧我们常选用A.
高碳钢
B.
中碳钢
C.
低碳钢
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反馈参考答案：
举一反三
【判断题】End systems connect to Internet via access ISPs(Internet Service Providers).
A.
正确
B.
错误
【单选题】under which of the following conditions is the supplier most able to influence or control buyers?
A.
when the supplier's products are not differentiated
B.
when the purchasing industry is an important customer to the supplying industry
C.
when the supplier does not face the threat of substitute products
D.
when the industry is controlled by a large number of companies
【简答题】If we ________ our relations with that country, we’ll have to find another supplier of raw materials. A) diffuse B) diminish C) terminate D) preclude
【简答题】除筛号外 , 也可用来表示筛孔内径的大小,即 每英寸(2.54cm)长度上有多少筛孔。
【简答题】阈值增大说明细胞的兴奋性___。
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