一受扭等截面圆轴,当直径缩小为一半时,其最大剪应力是原来的( )倍。
A.2 B.4 C.8 D.10
参考答案:C
阅读下面短文,并借助上下文和插图补充所缺信息。每个空只能填写一个形式正确、意义相符的单词。
One day my uncle was (1)______ a newspaper and learned that (2)______ were our friends. We should
get (3)______ well with them. He looked at his nice bird in the cage, and decided (4)______ let it fly back
home nature. He took the cage with the bird in it and went to a little hill near his house by (5)______. He
(6) ______ the door of the cage, and the bird (7)______ away quickly. Seeing this, my uncle felt very happy.
He went home with the empty (8)______. When he got back, he sat in a chair and (9)______ a rest. A
moment later , to his (10)______, he found the bird back in the cage.
治疗肠痈的方剂是()
A.仙方活命饮
B.苇茎汤
C.大黄牡丹汤
D.大承气汤
E.凉膈散