皮皮学，免费搜题
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【单选题】
齿轮渐开线在（ ）圆上的压力角最小A.
齿根圆
B.
基圆
C.
齿顶圆
D.
分度圆
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】下列电离方程式书写正确的是( )
A.
NaHSO 4 ＝Na ＋ ＋H ＋ ＋SO (熔融态)
B.
NaHCO 3 ＝Na ＋ ＋H ＋ ＋CO
C.
CH 3 COOH CH 3 COO － ＋H ＋
D.
H 2 CO 3 2H ＋ ＋CO
【单选题】She still remembers the days ______ she spent in the countryside.
A.
while
B.
that
C.
when
D.
during which
【简答题】When my period came, my mother told me “our women's motto was to ________”.
【单选题】下列电离方程式书写正确的是 [ ]
A.
NaHSO 4 ＝Na + ＋H + ＋SO 4 2- (熔融态)
B.
NaHCO 3 ＝Na + ＋H + ＋CO 3 2-
C.
CH 3 COOH CH 3 COO - ＋H +
D.
H 2 CO 3 2H + ＋CO 3 2-
【简答题】When my mother told stories to me,she always looked me with a smile.
【简答题】She still remembers the year _______ she spent in Sydney.
【简答题】When my period came, my mother told me “ our(women ’ s) motto was to ________ ” .
【多选题】下列电离方程式书写正确的是 [ ]
A.
NaHSO 4 ＝Na + ＋H + ＋SO 4 2-
B.
NaHCO 3 ＝Na + ＋H + ＋CO 3 2-
C.
CH 3 COOH CH 3 COO - ＋H +
D.
H 2 CO 3 2H + ＋CO 3 2-
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