题目内容：
平焊法兰的法兰材料常用A3和（）号钢制造。A．10
B．20
C．25
D．40
参考答案：
单选：平焊法兰的法兰材料常用A3和（）号钢制造。A．10B．20C．25D．40
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A．10
B．20
C．25
D．40
A．10
B．20
C．25
D．40
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CW-430差压计的附记压力部分是由一个()螺旋弹簧管和在原理上与差压显示部分相同的四连杆机构组成的。A．(A)单圈;B．(B)无限位件;C．(C)多圈;D．(D)有限位件
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