题目内容

Today, nearly all of the major 3PL service providers have () alliance partners.

A. multiple
B. multiply
C. minimum
D. maximum

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Understanding how materials flow through a supply chain is the key () properly define supply chain requirements.

A. for
B. to
C. as
D. of

现在汽车空调系统采用的制冷剂是

A. R12
B. R134
C. R134a
D. R22

R134a空调系统的冷冻机油可以和R12的混用。（）

A. 对
B. 错

R12不含氯原子，对大气臭氧层不起破坏作用

A. 对
B. 错