问题
单项选择题
黄铜管焊接后,焊缝应进行焊后热处理,处理温度为()℃。
A.300~350
B.350~400
C.400~450
D.450~500
答案
参考答案:C
黄铜管焊接后,焊缝应进行焊后热处理,处理温度为()℃。
A.300~350
B.350~400
C.400~450
D.450~500
参考答案:C
Here is the bulletin board in Class 2. Some of the notes can be seen every day. Here are some notes before a holiday. Please read them and answer the following questions.
小题1:The meaning of “bulletin board” is _________.
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