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【单选题】
有一头奶牛于3d前娩出一健康的牛犊，此后，母牛食欲欠佳。今早上发现其持续努责拱背。临床检查发现体温升高，呼吸、脉搏加快，精神沉郁，瘤胃蠕动减弱。外观可见有污红色恶臭的液体从阴道流出，侧卧时排出量增多。该情况可诊断为（）A.
胎衣不下
B.
子宫脱出
C.
子宫破裂
D.
胎衣不下引发子宫内膜炎
E.
产后低血钙症
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【单选题】如图 所示 , 质量为 m 的物体用平行于斜面的细线联结置于光滑的斜面上,若斜面向左方作加速运动,当物体刚脱离斜面时,它的加速度的大小为
A.
gsin
B.
gcos
C.
gtan
D.
gcot
【简答题】In those days even bicycles were very dear and hard to ______, and coupons were issued for them.
【简答题】And even graves themselves soon ______back into the soil.
【单选题】Some people say that if the holder of chopsticks pushes them______ his stomach to even them up instead of tapping them on the table, the chances are he is a coolie.
A.
on
B.
against
C.
at
D.
to
【单选题】Every minute is made full _____ of _____ our lessons well.
A.
to use; study
B.
use; studying
C.
use; to study
D.
used; studying
【单选题】Much to her delight, three _________ neighbors showed up and several of them even brought with them some candies and cookies.
A.
dozens
B.
dozen
C.
dozen of
D.
dozens of
【简答题】In those days even bicycles were very dear and hard to ______, and coupons were issued for them.
【单选题】如图所示,质量为m的物体用平行于斜面的细线连接置于光滑的斜面上,若斜面向右方作加速运动,当物体刚脱离斜面时,它的加速度的大小为( )
A.
;
B.
;
C.
;
D.
。
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