【单选题】Subliminal ads are invisible because they are shown very______.
【简答题】At present, mobile ads take a small share of the advertising industry.
【单选题】严格检查是实现确保安全的手段和对()的要求。
【判断题】Small ads are very useful to us.
【单选题】下面关于螺纹说法错误的是()
B.
同一条螺旋线上相邻两牙对应点间的轴向距离称为螺距
【单选题】关于螺距(P)与导程(L),下面哪一种说法是正确的?( )
B.
螺距只是螺纹上相邻两个牙型在中径线对应点间的轴向距离,导程是螺旋线上相应点的轴向距离
C.
螺距螺纹上相邻两个牙型对应点间的轴向距离,导程是沿同一条螺旋线旋转一周轴向移动的距离
D.
多线螺纹L=P/n(n是线数),单线螺纹P=L
【单选题】_____ a lot of small ads are put up on the walls, out city will be untidy.
【单选题】下列关于螺纹说法错误的是( )。
B.
同一条螺旋线上相邻两牙对应点间的轴向距离称为螺距
D.
多线螺纹导程 L 等于线数 n 与螺距的乘积
【判断题】对于单线螺纹,导程等于螺距P与螺纹线数n的乘积。
【单选题】The challenge that newspapers faced from the website is
A.
the small text-ads that appear alongside search engines.
B.
the localization of website and more elaborate service.