关于平面图形尺寸标注需注意的问题,以下说法错误的是( )。
A. 当对称或均匀分布的两个或多个圆弧为同一个圆的组成部分时,可标注其中某个圆弧的半径。
B. 图形上对称或均匀分布的圆弧或长槽,一般只需要标注其中一个的尺寸即可,也不必标注其数量。
C. 对于完整的圆,应标注孔的数量。
D. 圆周上均匀分布的孔或带圆的长槽,应标注出其圆心所在圆的直径作为其定位尺寸。并以细点画线作为其中心线。
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关于方案的图纸要求,是1号图(841mm×594mm)3-4张。()
A. 对
B. 错
Operating SystemsDear Mr. Tech,I'm considering buying a new ( 1 ). However, I don’t know which operating ( 2 ) to choose. Which one do you recommend?–James in GlenwallDear James,Each operating system (OS) has different benefits. Apple ® produces a popular ( 3 ) called OS X ® . This system has fewer known viruses than other systems. Microsoft ® makes an OS called Windows ® . One of its benefits is software compatibility. ( 4 ) works with a wide variety of programs. Finally, there is also the Linux ® OS. Linux ® is open ( 5 ) and easy to customize. I hope this helps you make your decision!– Mr. Tech
Engineer 2 prefers OS X® over Windows®.
A. 对
B. 错
OS X® is less likely to get viruses.
A. 对
B. 错