Why the power of small talk should never be underestimated?
A.Because people may begin a long lasting friendship or business association.
B.Because people may have a nice chat.
C.Because people may exchange information.
D.All above.
第2题
φ19mm常规钢抽油杆,带接箍的质量是()。
A.1.665kg/m
B.2.350kg/m
C.3.134kg/m
D.4.091kg/m
第5题
φ22mm常规钢抽油杆,其加大过渡部分长是()。
A.20mm
B.22mm
C.24mm
D.25mm
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