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【多选题】
按照零件互换程度的不同,可以将互换性分为哪两类?A.
完全互换性
B.
不完全互换性
C.
内互换
D.
外互换
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【单选题】The old man had a heart problem and needed________to the hospital right away. A. going B. to go C. went D. goes
A.
going
B.
to go
C.
went
D.
goes
【单选题】下列哪项是生物素-亲和素系统放大作用的主要机制？( )
A.
经化学修饰生物素成为活化生物素
B.
亲和素的四个生物素部位，可同时结合多价性的生物素化衍生物
C.
两者之间极高的亲和力
D.
生物素、亲和素可分别与酶、放射性核素等结合形成标志物
E.
以上均不是
【简答题】简述钢屋盖结构屋面支撑的种类。
【简答题】简述屋盖支撑的分类。
【简答题】已知四阶行列式 D 中第三列的元素依次为 -1,2,0,1 . (1) 如果 D 的第三列元素的余子式依次为 5,3,-7,4, 则 D= (2) 如果第四列元素的余子式依次为 5,a,-7,4 , 则 a=
【单选题】She ______ someone, so I nodded to her and went away.
A.
phoned
B.
had phoned
C.
was phoning
D.
has phoned
【单选题】He went to the boy, and _______ him on the shoulder, took him away.
A.
pat
B.
patting
C.
patted
D.
to pat
【单选题】I wanted to have a talk with her, but she ______ me and went away.
A.
upset
B.
calmed
C.
ignored
D.
set
【简答题】阅读理解。 It was Sunday morning. Tom and his friend Dick went to the river to go fishing. Tom took his dog Tim with him.The dog usually sat quietly on the river bank.But sometimes when he saw a small anim...
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