Can you tell me what ______ next Sunday?
A. will they do
B. they would do
C. would they do
D. they will do
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She asked me if I knew______________.
A. whose pen was it
B. whose pen it was
C. whose pen it is
D. whose pen is it
40CrNiMo是一种合金结构钢，元素符号前面的数字40表示()。
A. 钢中含碳的千分数
B. 钢中含碳量的万分数
C. 钢中含碳量的百分数
D. 钢中合金元素的总含量
手用丝锥的材料应采用_____。
A. 碳素工具钢
B. 低合金工具钢
C. 高速钢
D. 碳素结构钢
W6Mo5Cr4V通常应用于_____。
A. 工程结构
B. 钣金结构
C. 切削工具
D. 焊接结构
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