问题
单项选择题
正火能够代替完全退火，获得的组织强度和硬度和退火相比（）
A．更高
B．更低
C．一样
D．不一定
答案
参考答案：A
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正火能够代替完全退火，获得的组织强度和硬度和退火相比（）
A．更高
B．更低
C．一样
D．不一定
参考答案：A
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| My brother, Tom, 1 in a butcher's shop(肉店). He helps the butcher to do some 2 He puts meat on the shelf every day. People come into the shop and buy the meat. But today there 3 any meat on the shelf . The butcher asks Tom to carry 4 onto the shelf. Tom runs to get some 5 . They are in 6 room and they are on the highest shelf. Tom is tall, but he still can't reach the meat. Tom thinks 7 a minute. He has a good idea. He takes 8 and puts the one on the top of the other. Then he stands on 9 . Now he can reach 10 easily. | ||||
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