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【单选题】
一种筛检乳腺癌的实验应用于已经病理检查证实的乳腺癌患者400人和未患乳腺癌400人。结果患癌组有100例阳性,未患癌组有50例阳性。该试验的灵敏度为( )A.
100/400
B.
350/400
C.
100/150
D.
100/300
E.
350/650
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【单选题】Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net. 【B1】______ they hope for a good catch of fish. But to their 【B2】______ ...
A.
As a result
B.
As it is
C.
As expected
D.
As usual
【简答题】I’m going to Tianjin early tomorrow morning.So I would like to request an early morning call.
【简答题】高速走丝电火花线切割机床的的数控系统大多采用()A. 步进电动机开环系统 B. 步进电动机闭环系统 C. 伺服电动机半闭环系统 D. 伺服电动机全闭环系统
【单选题】Most of the dead villagers were children because
A.
it was early morning of the school day
B.
the others except schoolchildren could leave the village
C.
children were asked to keep there for the sake of security
D.
children escaped more slowly than the others
【单选题】Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.【1】they hope for a good catch of fish. But to their【2】, a horrible sight...
A.
As a result
B.
As it is
C.
As expected
D.
As usual
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