能引起原料品质发生变化的化学因素是______。
A.农药
B.化肥
C.药物残留物
D.细菌
E.遗传基因
F.转基因
参考答案:A,B,C
A project manager has just been assigned to a new project and has been given the project charter. The FIRST thing the project manager must do is______.
A) create a project scope statement B) confirm that all the stakeholders have had input into the scopeC) analyze project risk D) begin work on a project management plan
蔬菜中含有丰富的营养素,特别是富含维生素和()。
A、营养素
B、矿物质
C、叶绿素
D、蛋白质