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【单选题】
.成人脊髓下端平( )A.
第一腰椎下缘
B.
第二腰椎下缘
C.
第三腰椎下缘
D.
第四腰椎下缘
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反馈参考答案：
举一反三
【判断题】It has been found to be at least a partial constituent in over 90 per cent of all chemicals known to man.
A.
正确
B.
错误
【多选题】PHP 中,单引号和双引号所包围的字符串有什么区别?( )(选择两项)
A.
单引号速度快，双引号速度慢
B.
双引号速度快，单引号速度慢
C.
两者没有速度差别
D.
双引号解析其中以 $ 开头的变量，而单引号不解析
E.
单引号解析其中 \r \t 等转义字符，而双引号不解析
【判断题】It has been suggested that automation becomes economically viable only when a facility handles at least 50,000 cartons a day.
A.
正确
B.
错误
【简答题】It has been _______ (翻译) into at least 125 languages.
【简答题】A powerful earthquake in northern Japan has killed at least six people and injured more than 100. Power has been cut to many homes and businesses, but for now, officials say two major nuclear power 1 ...
【单选题】It has been at least three years ______ these trees were planted.
A.
that
B.
when
C.
since
D.
as
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