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【简答题】
在常用螺纹牙型中, 形螺纹的传动效率最高, 形螺纹的自锁性最好。
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反馈参考答案：
举一反三
【单选题】仓储在物流中起着“蓄水池”的作用,可以调节两种矛盾
A.
一是消费与加工的矛盾、二是配送的矛盾
B.
一是生产与加工的矛盾，二是配送的矛盾
C.
一是生产与消费的矛盾，二是运输的矛盾
D.
一是生产与加工的矛盾，二是运输的矛盾
【单选题】He gave ______ to the gid at the desk.
A.
the stamp
B.
his letter
C.
the stamp and his letter
【单选题】听力原文：Before going to the gas station to have his tank filled, Wright posted his letter and then went to buy a kilo of meat at the supermarket near the cinema． Which place has Wright NOT been to?
A.
The gas station.
B.
The post office.
C.
The supermarket.
D.
The cinema.
【单选题】According to his letter,he had to _______ his affairs in Paris before he could return home．
A.
settle
B.
suffer
C.
pack
D.
persuade
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