投料试车应在工程竣工验收后进行，由（ ）负责。A.发包人B.承包人C.工程师###SXB#

According to passage, when an assembler buys a firm that makes some important component of the end product that the assembler produces, independent suppliers of the same component may______A．withhold technological innovations from the assemblerB．experience improved profit margins of on sales of their productsC．lower their prices to protect themselves from competitionD．suffer finanical difficluties and go out of businessE．stop developing new versions of the component 点击查看答案

工程建设过程中，施工场界内的污染防治属于（ ）。A.职业健康安全问题B.安全生产问题###SXB

A.职业健康安全问题
B.安全生产问题
C.环境保护问题
B.环境治理问题

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