用原子发射光谱法直接分析海水中重金属元素时 , 应采用的光源( ) A. 低压交流电弧光源 B. 直流电弧光源 C. 高压火花光源 D. ICP 光源
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举一反三
【判断题】Compared to joint ventures and direct investment, exporting consists of the least risk for a company which wants to enter the international market.()
【单选题】Consider an accounting firm which hires workers to enter data into a computer program. Which of the following would be considered a short run decision?
A.
The firm would like to hire ten more workers for a weekend shift.
B.
The firm is considering an investment in additional computers.
C.
The firm would like to build its own facility.
D.
The firm might purchase new computer software that would require some new computer hardware as well as extensive training for workers.
【简答题】One of the biggest challenges facing students and their families is what career they should enter and what is the best path for them to take. I was talking to someone the other day who told me he firs...