皮皮学,免费搜题
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搜题
【单选题】
主要用于碳素工具钢、合金工具钢和可锻铸铁工件的磨料是( )。
A.
绿碳化硅
B.
棕刚玉
C.
黑碳化硅
D.
白刚玉
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举一反三
【单选题】循环性缺氧可由下列何种原因引起
A.
大气供氧不足
B.
血中红细胞数减少
C.
组织供血量减少
D.
血中红细胞数正常但血红蛋白减少
E.
肺泡弥散到循环血液中的氧量减少
【单选题】More than _______ students in our school did their best to raise money for the quake-hit areas. [     ]
A.
two thousands
B.
two thousand
C.
thousands
D.
thousand
【单选题】-How did you the money? -We helped an elementary school in our city.
A.
deal
B.
deal with
C.
do
D.
do with
【单选题】循环性缺氧可由下列何种原因引起
A.
大气供氧不足
B.
组织供血量减少
C.
血中红细胞数减少
D.
血中红细胞数正常但血红蛋白减少
E.
肺泡弥散到循环血液中的氧减少
【单选题】循环性缺氧可由下列何种原因引起
A.
组织供血量减少
B.
大气供氧不足
C.
血中红细胞数减少
D.
血中红细胞数正常但血红蛋白减少
E.
肺泡弥散到循环血液中的氧量减少
【单选题】_____  a new library_____ in our school last year? [     ]
A.
Is; built
B.
 Was; built
C.
Does; build
D.
did, build
【单选题】Our school did not______for Christmas until mid-December.
A.
break out
B.
break down
C.
break in
D.
break up
【单选题】There used to be a church in our school, ___________?
A.
used there
B.
did there
C.
usedn’t there
D.
wasn’t there
【单选题】Then ____ a foreign delegation would come to our school.
A.
the news that
B.
came the news that
C.
did the news come
D.
came the news which
【单选题】关于银杏叶药物使用,下列不正确的是
A.
新鲜银杏叶晒干可直接泡茶喝
B.
银杏树是植物活化石
C.
银杏叶的提取物含槲皮素
D.
槲皮素中葡萄糖苷具有抗氧化作用
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