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【单选题】
近年来白血病发病率呈上升趋势,多数研究认为其与苯暴露有关。某肿瘤研究所以某地苯作业的工人为研究对象,进行了10年的随访,计算白血病发病率,并与同期该地白血病发病率进行比较。该对照形式为A.
内对照
B.
外对照
C.
总人口对照
D.
多重对照
E.
标准对照
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举一反三
【简答题】A．File idea occurred to him when he went shopping yesterday. B．He got the idea when he was on his way back yesterday. C．He had the idea when he was lying in bed last night. D．He got the idea on his wa...
【单选题】When he ________ home, he saw his mother the room.
A.
got back; clean
B.
got on; cleaning
C.
got at; clean
D.
got back; cleaning
【单选题】When Tom was very young, he was terribly frightened of snakes, but he soon ______ it.
A.
got over
B.
got across
C.
got through
D.
got off
【单选题】某会计人员根据记账凭证登记入账时，误将900元填写为9000元，而记账凭证无误，应用( )予以更正。
A.
划线更正法
B.
补充登记法
C.
红字更正法
D.
平行登记法
【简答题】炉衬的破损原因主要有高温热流的作用、（）、机械冲撞的作用、化学侵蚀等几方面作用。
【简答题】炉衬的破损原因主要有高温热流的作用、（）的作用、（）的作用、化学侵蚀等几方面作用。
【简答题】When he got to the crossroads, he went in the wrong (direct) _____
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