有权宣告专利权无效的机关是()。
A.专利局
B.专利审查员
C.专利复审委员会
D.中级人民法院
参考答案:C
—Boys and girls! Please ______ your compositions after class.
—Oh, my god! I ______ it at home. [ ]
A. hand in, forgot
B. hand in, left
C. hand over, forgot
D. hand out, left
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