By the 1950s, the wireless had become an established feature of every home.（）

These should not be allowed to turn our attention away ...

未知题型These should not be allowed to turn our attention away from the sound, established materia

the finish datum surfaces should always be machined at ...

判断题the finish datum surfaces should always be machined at the beginning of the machining process, and then other surfaces can be machined by taking the finish datum surfaces as location datum（）

When we draw views of composite solids, the views of th...

判断题When we draw views of composite solids, the views of the each feature should be drawn first, and then the datum lines.（）