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单项选择题

下列量具中，哪些是属于专用量具：游标卡、螺纹规、圆角规、外卡钳

A、螺纹规
B、游标卡尺
C、圆角规
D、外卡钳
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判断题
在一个生长轮内，环孔材的早材管孔比晚材管孔显著为大，并沿着生长轮呈环状排列一至数列。
单项选择题
An investor has the choice between two investments. Investment Exe offers interest of 4% per year compounded semi-annually for a period of three years. Investment Wye offers one interest payment of 20% at the end of its four-year life. What is the annual effective interest rate offered by Investment Exe and Wye?
A、4.00% 4.66%
B、4.00% 5.00%
C、4.04% 4.66%
D、4.04% 5.00%
A.00%
B.66%
C.00%
D.00%
E.04%
F.66%
G.04%
H.00%
判断题
硝化过程只发生了氮的转化，没有氮的去除。
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