【单选题】用几个相交的剖切平面画剖视图,说法正确的是( )
D.
当两要素再图形上具有公共对称中心线或轴线时,可各画一半
【单选题】听力原文:M: Did you hear about the air crash that occurred in South America recently? It was quite a tragic accident! W: No, I didn't see anything in the news about it. What happened? M: A foreign airline...
C.
Breakdown of the engines.
D.
Communications system failure.
【多选题】在剖视图中,以下哪些情况可以省略标注或者不必标注?
A.
当剖视图按投影位置关系配置,中间又没有其他图形隔开,可省略投射方向
B.
当单一剖切平面通过机件的对称面或者基本对称面,并且剖视图按投影位置关系配置,中间又没有其他图形隔开时,剖切符号不必标注
C.
当单一剖切平面的剖切位置明确时,局部剖视图的剖切符号不必标注
D.
当两个相交的平面剖切机件时,全剖视图的剖切符号不必标注
【单选题】用“几个相交的剖切平面”画剖视图,说法正确的是:( )
D.
当两要素在图形上具有公共对称中心线或轴线时,可各画一半
【单选题】―Did you hear the news? Liu Mei is going to move to Canada. ―________. [ ]
A.
I’m sorry to hear that
【单选题】—______, everybody. You did very well in this class performance. —Thank you. [ ]
A.
I'm sorry to hear that
【单选题】听力原文:M: Did you hear about the air crash that occurred in South America recently? It was quite a tragic accident! W: No, I didn't see anything in the news about it. What happened? M: A foreign airline...
C.
Breakdown of the engines.
D.
Failure of the communications system.
【判断题】杂交育种成功的三个必要因素包括正确的亲本选择;合适的杂交方式;合理的处理杂种后代的方式
【判断题】堆栈指令中进栈指令 LPS 和出栈指令 LPP 必修成对使用
【单选题】用“几个相交的剖切平面”面剖视图,说法正确的是: ( )。
D.
.当两要素在图形上具有公共对称中心线或轴线时,可各画半