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【单选题】
—When ______ this activity________ every year? —It is held in spring every year. [     ]
A.
is; happened
B.
does; take place
C.
is; happening
D.
is ; taken place
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【简答题】简述车间种子制备时确定种子罐级数应考虑的因素及确定种子罐级数的一般方法。
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