剖面图中切到的可见部位用()表示。
A.细实线;
B.中实线;
C.粗实线;
D.折断线
参考答案:C
在飞机机翼末端的前缘有一加厚区,用来消除颤振现象,这是仿照哪种昆虫的特点?()
A、家蚕
B、蜜蜂
C、蜻蜓
D、瓢虫
Define Activities is the process of identifying the specific actions to be performed to produce the ______。
A.project elements B.work draftsC.work package D.project deliverables