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【单选题】
妊娠呕吐的特点A.
呈喷射状，无恶心先兆
B.
有恶心，吐后不感轻松，胃排空后仍干呕不止
C.
常伴有眩晕，眼球震颤
D.
伴有腹痛，腹泻
E.
已婚妇女停经，晨起呕吐
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【单选题】—Could you tell me _________? — You can take No. 16 bus.
A.
how can we get to the Olympic Park
B.
how we can get to the Olympic Park
C.
how did we get to the Olympic Park
D.
how we got to the Olympic Park
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【单选题】下列关于触发器描述错误的是( )。
A.
一个表在相同的触发事件和相同的触发时间只能创建一个触发器。
B.
触发事件为INSERT,触发时间为AFTER的触发器只能有一个
C.
一个表在相同的触发事件上可以创建两个触发器
D.
触发器可以显示调用
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