如图所示受力杆件中,n-n截面上的轴力为:()
A.P
B.2P
C.3P
D.6P
参考答案:C
解析:由截面法可知,n-n截面上的轴力N=6P-3P=3P。
Little _ that we were watching his every move, so he seemed to be going his own way in this
business: [ ]
A. he realized
B. he didn't realize
C. didn't he realize
D. did he realize
耐火瓷球的使用温度是()℃。
A.600
B.700
C.500
D.800