皮皮学，免费搜题
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【简答题】
病毒的血凝性具有 ,而血凝抑制性具 。
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皮皮学刷刷变学霸
举一反三
【单选题】When he was out of work, Frank was a couch potato and he
A.
put on a lot of weight
B.
lost a lot of weight
C.
l ost a lot of height
D.
put on a lot of height
【多选题】装有（ ）的出站信号机，当该表示器不良时，由办理发车人员通知司机后，列车凭出站信号机的显示出发。
A.
方向表示器
B.
进路表示器
C.
线路表示器
D.
发车线路表示器
【单选题】When will college students curb their spending and only buy what is necessary?
A.
After they have lived on campus for a relatively long time.
B.
When they have got used to living according to their money-spending plan.
C.
After they have had roommates to share furnishing or grocery expenses with them.
D.
When they have known that their hard- earned money shouldn’t go to movies.
【简答题】When he was only years old, he was asked to work on a project and quickly became a in Berlin.
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