题目内容

离心机运行是由DCS启动。（)

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Poorest economies can attract more FDI because of policy package. （)

Per capita GDP in the richest part of the world has grown two times faster than that in the poorest part of the world.（)

干燥过程也能脱除一部分树脂中残留的氯乙烯单体。（)

露天堆垛，堆垛场地应该坚实、平坦、干燥、无于四周地面，垛底还应该垫高（）厘米，四周必须排水畅通。

A. 50
B. 60
C. 40
D. 70