【单选题】柴油机直接驱动螺旋桨工作时,随转速的提高,指示效率η i 和机械效率η m 的变化规律是______。
【单选题】She was lifting handfuls of fine sand and letting it pour __________ her fingers.A.acrossB.inC.th
A.
15.She was lifting handfuls of fine sand and letting it pour __________ her fingers. A.across
【简答题】She let the chance _____________ through her fingers.
【单选题】压力容器低应力脆断的断口与单纯的材料脆化断口相比较,最重要的明显差别是低应力脆断断口上有()。
【判断题】32应力腐蚀是由拉应力与腐蚀介质联合作用而引起的低应力脆性断裂。( )
【单选题】"She has green fingers" means ( ).
B.
There is something with her fingers
C.
She is good at gardening.
【单选题】She her fingers around the doornob.
【简答题】“一带一路”建设的目标包括( )。A. 政策沟通; B. 设施联通; C. 贸易畅通; D. 资金融通; E. 民心相通;