一被连接件较厚,不宜做成通孔,且需经常拆卸时,应采用( )连接。
A.铰制孔螺栓
B.普通螺栓
C.螺钉
D.双头螺柱
参考答案:D
Look and choose. (将短语与图画相匹配,其中有三个多余选项)
A. play the piano
B. take a picture
C. play football
D. do the cleaning
E. play the violin
F. draw a picture
G. collect stampsH. listen to music
1.________ 2._______ 3.________ 4.________ 5._________
图像模拟放大(ZOOM)后数字矩阵不再和相机整个视野对应;如果放大因子为2,像素面积变为原来的()
A.2倍
B.4倍
C.0.5倍
D.0.25倍
E.0.1倍