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【多选题】
应用叠加定理分析电路时,关于电源置零的说法正确的是( )A.
电压源置零相当于开路
B.
电压源置零相当于短路
C.
电流源置零相当于开路
D.
电流源置零相当于短路
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举一反三
【单选题】连杆螺栓结构特点有( )。I.螺纹多为精加工细牙螺纹 II.杆身最小直径应等于或小于螺纹内径 III.杆身最小直径应大于螺纹内径 IV.采用耐疲劳柔性结构 V.螺帽应有防松装置 VI.杆身为等截面圆柱体
A.
Ⅱ＋Ⅲ＋Ⅴ＋Ⅵ
B.
Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C.
Ⅲ＋Ⅳ＋Ⅴ＋Ⅵ
D.
Ⅰ＋Ⅱ＋Ⅴ＋Ⅵ
【单选题】She showed him the photo she ______ the day before. ( )
A.
has taken
B.
took
C.
was taking
D.
had taken
【简答题】She
showed him the photo she _______ the day before.A. has
taken B. took C. was
taking D. had
taken
【单选题】（ ）She showed him the photo she__________theDay before．
A.
has taken
B.
took
C.
Was taking
D.
had taken
【简答题】(2008年)统计表按总体是否分组及分组的程度不同,可分为____________、____________和____________。
【单选题】连杆螺栓结构特点有（）。Ⅰ.螺纹多为精加工细牙螺纹Ⅱ.杆身最小直径应等于或小于螺纹内径Ⅲ.杆身最小直径应大于螺纹内径Ⅳ.采用耐疲劳柔性结构Ⅴ.螺帽应有防松装置Ⅵ.杆身为等截面圆柱体
A.
Ⅱ＋Ⅲ＋Ⅴ＋Ⅵ
B.
Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C.
Ⅲ＋Ⅳ＋Ⅴ＋Ⅵ
D.
Ⅰ＋Ⅱ＋Ⅴ＋Ⅵ
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