【判断题】在Windows的界面中,有些菜单选项为灰色显示,这意味着这些菜单选项暂不可用。
【单选题】According to the passage, which of the following is NOT true?
A.
Vietnam War is the military struggle fought in Vietnam from 1959 to 1975, involving the North Vietnamese in conflict with the United States forces and the South Vietnamese army.
B.
In 1965 the United States got involved in the war in order to pr the South Vietnamese government from collapsing.
C.
During the conflict, approximately 1.5 to 2 million Vietnamese on each side were killed and more than 58,000 Americans lost their lives.
D.
The U.S. government supported the South Vietnamese government and its policies led to rebellion in the North.
【判断题】超声波纵波斜入射时,当入射角大于第一临界角小于第二临界角时,在第二介质内只有折射横波。( )[1分]
【判断题】超声波纵波斜入射时,当入射角大于第一临界角小于第二临界角时,在第二介质内只有折射横波。 ( )
【单选题】在Windows的界面中,有些菜单选项为模糊显示,这意味着这些菜单选项_______。
【判断题】超声波纵波斜入射时,当入射角大于第一临界角小于第二临界角时,在第二介质内只有折射横波。
【多选题】(7-16)面向对象程序设计中,使用设计模式的作用包括( )。
【单选题】The World Trade Organization:
A.
assists importers and exporters in conducting their trade.
B.
works together with United Nations forces to enforce international decisions.
C.
organizes the negotiations involved in trade agreements and resolves disputes among members.
D.
promotes trade by organizing educational conferences.
【单选题】在Windows2000的界面中,有些菜单选项为模糊显示,这意味着这些菜单选项( )
【判断题】在Windows的界面中,有些菜单选项为灰色显示,这意味着这些菜单选项暂不可用。