【简答题】What
does the narrator of “Rip Van Winkle” describe as “the great error in Rip’s
composition”? (10.0分)A. That
he is “henpecked” by Dame Van Winkle. B. His
unwillingness to work. C. His
weakness for sp...
【判断题】解调是调制的逆过程,它的作用是将已调波信号变换为携有信息的电信号。
【单选题】Which of these may be a sign that more than one night has passed when Rip van Winkle awakens?
A.
Rip Van Winkle is covered in a thick blanket of moss
B.
A rust encrusted firelock
C.
Rip Van Winkle wakes up in a coffin
D.
A calendar dated July 4, 1788
【单选题】“Rip Van Winkle” reveals the theme of _______ the past.
【单选题】Who is Rip Van Winkle?
【判断题】焊接场地应符合安全要求,否则会造成火灾、爆炸、触电事故的。( )
【多选题】焊割作业时,对于焊接场地有哪些要求?( )
A.
焊接与气割场地应通风良好,应采取措施避免作业人员直接呼吸到焊接操作所产生的烟气流
C.
在室内或露天场地进行焊接及碳弧气刨工作,必要时应在周围设挡光屏,防止弧光伤眼
D.
焊接场所应经常清扫,焊条和焊条头不应到处乱扔,应设置焊条保温筒和焊条头回收箱,焊把线应收放整齐
【单选题】下列关于焊接场地的描述,不符合焊割作业要求的是()
A.
丁场地没有焊条保温筒和焊条头回收箱,地上散落有焊条和焊条头
B.
在室内或露天进行焊接及碳弧气刨工作时,丙场地在周围设置了挡光屏,防止弧光伤眼
D.
甲场地通风良好,并采取措施避免作业人员直接呼吸到焊接操作所产生的烟气流