内外径之比为a的空心圆轴,两端受扭转力偶矩作用。若下列四种轴的横截面面积相等,()轴的承载能力最大。
A.a=0(实心轴)
B.a=0.5
C.a=0.6
D.a=0.8
参考答案:D
根据汉语提示补全句子。
1. Mary ____________ (感觉) sick.
2. He ____________ a fever. (发烧).
3. My ____________ (胳膊) hurt.
4. I am ____________ (生气).
5. My throat is ____________ (疼).
6. My brother is a ____________ (医生).
Could I look at your picture? --Yes, of course you ______.
A.could
B.can
C.will
D.do