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【判断题】
攻螺纹前的底孔直径必须大于螺纹标准中规定的螺纹小径。A.
正确
B.
错误
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【简答题】已知某LTI系统的频率响应为 ，当输入信号为阶跃信号时，求系统的零状态响应。
【单选题】Play Play is the principal business of childhood，and in recent years research has shown the great importance of play in the development of a human bein9．From earliest infancy． every child needs opport...
A.
he should be allowed to choose his own toys．
B.
he should be given identical toys．
C.
he should be given different toys．
D.
he should be given fewer and fewer toys．
【多选题】卖方需出具的最常用的单据有8个,包括以下 。
A.
B/L (Bill of Lading)
B.
Commercial Invoice
C.
Packing List
D.
Shipping Advice
【单选题】下图为液压千斤顶的工作原理图。P为压力，h为行程，A为活塞面积，则运动关系式为（ )。
A.
A2W=A1F
B.
A1h2=A2h1
C.
A1h1=A2F
D.
A1h1=A2h2
【单选题】下图为液压千斤顶的工作原理图。P为压力，W为负载，A为活塞面积，则（ ）。
A.
W/A1=F/A2
B.
W/F=A2/A1
C.
W/F=A1/A2
D.
W/A2=A1/F
【简答题】短语英汉对译 1)原始资料 2)observational research 3)探索性调研
【单选题】---- Did he come back early last night? ---- Yes. It was not yet eight o’clock _______ he arrived home.
A.
when
B.
that
C.
before
D.
until
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