汽轮机同一级的叶片常用围带或拉筋成组连接,下面关于围带作用的描述错误的是()。
A.增加叶片的做功能力;
B.调整叶片频率;
C.增加叶片的刚性;
D.防止叶片断裂。
参考答案:A
The boy ________ avoided being run over by a speeding car when crossing the busy street the other day.
A.hardly
B.slightly
C.narrowly
D.gently
什么是节电降损?