应力腐蚀断裂属于()
A.脆性断裂
B.韧性断裂
C.塑性断裂
参考答案:A
把一只电阻R接到某电源上,此时电路中的电流为0.6A,若在电路里并联一只30Ω的电阻,此时干路的电流为0.8A,求电源电压和电阻R的阻值.
The number 5.12 is a special number,__ ,I think, that will be remembered by Chinese people forever.
A.what
B.it
C.which
D.one