盐浴炉加热的优点升温快、加热均匀,可以实现金属坯料整体或局部的无氧化加热
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所谓温度头,是指设定的炉温高出始锻温度的数值
A. 对
B. 错
氢是钢中危害性最大的气体,它在钢中的含量超过一定极限值时,会在锻后冷却过程中,在锻件内部产生白点和氢脆缺陷,使钢的塑性显著下降
A. 对
B. 错
I have to finish my homework first_____ cleaning up the room.
A. because of
B. instead of
C. in front of
D. at the end of
Lu Han is_____an excellent actor _____ most teenagers like him.
A. such; that
B. so; that
C. too; to
D. not; but