In form-based authentication, what must be included in the HTML returned from the URL specified by the element?()
A. a base-64 encoded user name and password
B. a form that POSTs to the j_security_check URL
C. an applet that requests the user name and password from the user
D. a hidden field that supplies the login-constraint used by the applicatio
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在构造图的鞍部必须有两根等深度线平行穿过.
A. 正确
B. 错误
YJ19卷烟机的胶缸、胶管、上胶器清洗后,设备运行前要对供胶系统中的()进行排放,否则会出现气阻现象。
梁是产生弯曲变形的构件,它可分为___、悬臂梁和___。