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【单选题】
一标准直齿圆柱齿轮的齿距p=15.7mm,齿顶圆直径【图片】mm,则该齿轮的齿数为（ ）。A.
82
B.
80
C.
78
D.
76
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举一反三
【简答题】根据括号内的汉语提示,写单词完成句子。 1. She _____( 寄) a postcard to her mother yesterday. 2. Here is a map of ______( 欧洲). 3. I often swam in the ______( 湖) near my house when I was young. 4. My grandpa lives in the _...
【单选题】Here is a postcard, Jim ! -- Oh,_________ is my friend ,Mary.
A.
he
B.
it
C.
she
D.
his
【单选题】Here is a postcard, Jim ! -- Oh,_________ is my friend ,Mray.
A.
he
B.
it
C.
she
D.
his
【单选题】Here is a postcard for you, Jim! Oh, ______is from my friend, Mary.
A.
its
B.
it
C.
it's
【简答题】-Here is a postcard for you, Jim! -Oh, it is from ______ (my/ his) aunt, Mary.
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