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【多选题】
下列关于类毒素的说法正确的是（ ）A.
由外毒素经处理而成
B.
主要成分为脂多糖
C.
抗原性与外毒素相似
D.
毒性与外毒素相似
E.
是细菌分泌的
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【简答题】阅读理解。 No one was left in the museum now,and John was walking round to see if everything was all right. Suddenly he saw a beautiful painting lying on the floor. John picked it up and gave it to the dir...
【简答题】No one was left in the museum now, and John was walking round to see if everything was all right. Suddenly he saw a beautiful painting lying on the floor. John picked it up and gave it to the director...
【单选题】--- Lucy seems in low spirits. --- Yes, all her efforts were ____ and no one was interested in her invention.
A.
in need
B.
in vain
C.
in place
D.
in use
【简答题】商务谈判的程序可以分为 、 和 三个阶段。
【单选题】在土木工程制图中，除了遵守建筑工程制图标准和某些行业标准外，还必须遵守的国家标准为：()
A.
总图制图标准
B.
水利水电工程制图标准
C.
技术制图标准
D.
铁路工程制图标准
【简答题】P assage One In the United States, it is important to be on time, or punctual, for an appointment, a class, a meeting, etc. This may not be true in all countries, however. An American professor discov...
【判断题】Grant was in favour of a society where all men were equal in the sense that no one was entitled to more than others were.
A.
正确
B.
错误
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