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【单选题】
乙型病毒性肝炎的母婴传播途径,错误的是
A.
经胎盘垂直传播
B.
粪一口途径传播
C.
产时胎儿接触母血、羊水等传播
D.
密切生活接触
E.
母乳喂养
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参考答案:
举一反三
【判断题】“一般是将毒理学试验获得的数据外推到人,计算人体的每日允许摄入量”是食品安全风险评估的风险描述阶段。()
A.
正确
B.
错误
【单选题】将毒理学试验获得的数据外推到人,计算人体ADI的,是风险评估中的哪个阶段?
A.
危害识别
B.
危害描述
C.
暴露评估
D.
风险描述
【单选题】If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake, tossing and【C1】______in bed until the early hours of...
A.
turning
B.
rolling
C.
twisting
D.
rotating
【简答题】If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake, tossing and turning in bed until the early hours of ...
【单选题】参照完整性规则包括更新规则、删除规则和插入规则,关于这些规则的相关说明中,不正确的是________。
A.
更新规则规定了当更新父表中的连接字段(主关键字)值时,如何处理相关的子表中的记录
B.
当更新规则选择为“级联”时,表示用新的连接字段值自动修改子表中的相关所有记录
C.
删除规则规定了当删除父表中的记录时,如何处理子表中相关的记录
D.
插入规则规定了当插入父表中的记录时,是否进行参照完整性检查
【单选题】If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake, tossing and 【26】______ in bed until the early hours ...
A.
turning
B.
rolling
C.
twisting
D.
rotating
【多选题】电容器形成电容电流有多种工作状态、它们是
A.
充点
B.
放点
C.
稳定状态
【单选题】危害描述一般是将毒理学试验获得的数据外推到人,计算( )。
A.
人体每周耐受摄入量
B.
人体每日推荐摄入量
C.
人体每日容许摄入量
D.
人体每日耐受摄入量
【单选题】If you are worried about the problem , you should do something it .
A.
. about           
B.
. for               
C.
. against              
D.
. with
【简答题】If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake, tossing(翻来覆去) and turning in bed until the early hou...
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