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【单选题】
骨组织的食用价值在含有的A.
蛋白质
B.
脂肪
C.
无机物
D.
脂肪和骨胶
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举一反三
【单选题】According to the text, which of the following is true?
A.
Scientists can tell the motion of the earth from the motions of five other planets.
B.
A fixed star refers to a star that is always stationary on the sky.
C.
Ancient people had scant knowledge about the movement of the stars.
D.
All the stars on the sky can be seen all year long.
【多选题】关于表面粗糙度符号、代号在图样上的标注，下列说法中正确的是（）。
A.
符号的尖端必须由材料内指向表面
B.
代号中数字的注写方向必须与尺寸数字方向一致
C.
表面粗糙度符号或代号在图样上一般注在可见轮廓线、尺寸界线、引出线或它们的延长线上
D.
当零件所有表面具有相同的表面粗糙度要求时，其代号可在图样的右上角统一标注
【单选题】— ? —He is of medium build. [ ]
A.
What is Mike like?
B.
What does Mike like?
C.
Who is Mike like?
D.
What does Mike look like?
【单选题】Your radar is set on a true motion display．Which of the following will NOT appear to move across the PPI scope ________．
A.
Echoes from a buoy
B.
Own ship's marker
C.
Echo from a ship on the same course at the same speed
D.
Echo from a ship on a reciprocal course at the same speed
【单选题】What does Mike like to watch on television?
A.
soap operas
B.
westerns
C.
religious programs
D.
educational shows
【单选题】3关于尺寸界线的画法,错误的是
A.
A用细实线绘制
B.
B由图形的轮廓线,轴线或对称中心线处引出,也可以直接利用这些线作为尺寸界线
C.
C尺寸界线一般应与尺寸线垂直
D.
D在光滑过渡处标注尺寸时,必须用粗实线将轮廓线延长,从他们的交点处引出尺寸界线
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