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【单选题】
普通螺纹牙型角为（）。A.
30°
B.
55°
C.
60°
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反馈参考答案：
举一反三
【单选题】What the shopkeeper and the bird said are the same.
A.
Right.
B.
Wrong.
C.
Doesn't say.
【单选题】John's girlfriend didn't tell him what kind of perfume she liked.
A.
Right.
B.
Wrong.
C.
Doesn't Say.
【简答题】It is in the right for one to do what he likes which doesn’t do any harm to others’ interest. A) sensitive B) comfortable C) relative D) reasonable
【简答题】简述果树物候期的特点。
【简答题】坐果是在开花基础上进行的，又为果实发育做准备。这个现象反映的是果树物候期的（）特点？
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