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【判断题】
氮叶立德称为 Wittig 试剂。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】变频器的PID功能中,P指 。
【单选题】分度值为0.02mm的游标卡尺,当游标上的零刻线对齐尺身上20mm的刻线,游标上第50格刻线与 尺身上69mm的刻线对齐,此时读数值( )mm。
A.
20
B.
21
C.
19
D.
69
【简答题】Xiao Ming is a middle school student. He is a good boy, and he studies very hard. But his family is very poor, because his mother got ill a few years ago, and his father has no job. He makes money by ...
【单选题】He is naughty sometimes, but ____ he is a good boy.
A.
yet
B.
otherwise
C.
although
D.
already
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