当时，国外就讥讽中国不能制造高压设备，要建氮肥厂至少还需要10年到20年。
B-Time I-Time O B-Location I-Location O O O B-Organization I-Organization O O O O B-Thing I-Thing I-Thing I-Thing O O O B-Organization I-Organization I-Organization O O O O O B-Metric I-Metric I-Metric O B-Metric I-Metric I-Metric O