图5-10-10所示等直圆杆,抗弯截面系数为W,杆内最大正应力σmax为:()
A.21Pd/W
B.27Pd/W
C.39Pd/W
D.15Pd/W
参考答案:D
A: _______ do you eat fruit and vegetables?
B: Every day. [ ]
A. How
B. How often
C. What
D. Where
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