皮皮学，免费搜题
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【单选题】
非放射专业学生教学期间,有效剂量当量不得大于A.
0.2mSv/年
B.
0.3mSv/年
C.
0.5mSv/年
D.
1.0mSv/年
E.
1.5mSv/年
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】During the economic crisis, they had to cut back production and______workers.
A.
lay off
B.
lay into
C.
lay down
D.
lay aside
【简答题】Sony and Toyota are struggling. But one brand name is booming (繁荣) in Japan during the economic slowdown—Mickey Mouse. According to the company that runs Tokyo Disneyland, Japan’s busiest theme park w...
【简答题】是生命活动的主要承担者, 是遗传信息的携带者。
【简答题】They claim that ________ 1,000 factories closed down during the economic cr. A) sufficiently B) approximately C) considerably D) properly
【单选题】During the economic crisis, we should help those for ______life is far from easy．
A.
whom
B.
whose
C.
who
D.
whoever
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