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公司负债越多,经营风险越大。( )
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在优化资本结构的过程中,综合资金成本最小的方案一定是普通股每股收益最大的方案。( )
Grammar exercise: Choose the best answer to complete the sentence.1.The reading room________ yesterday afternoon.A.cleaned B.is cleaned C. was cleaned2.The workers were ________ to work ten hours a day.A.makeB.madeC.making3.Food________in a cool place in summer.A.must keep B.mustn’t keep C.must be kept4. Coal can ________ to produce electricity for agriculture and industry.A. have used B. used C. be used5. The room isn’t dirty any more .it__________.A.be cleaned B. cleaned C. has been cleaned6. The bridge ___________ next year.A. completed B. will be completed C. being completed7. Your new computer will soon become outdated, because technology_______so fast.A. is being developed B. developed C. has developed8. This place has________.A. been destroyed B. destroyed C. destroy9. All the preparations for the task ________ , and we are ready to start.A. completed B. complete C. have been completed10. The construction of the laboratory ____by the end of next month.A. must be completed. B. must completed. D.will be completing
在单缝夫琅和费衍射实验中，波长为λ的单色光垂直入射到单缝上，对应于衍射角为30o的方向上，若单缝处波面可分成3个半波带，则缝宽度a等于：【 】
波长为400nm的光垂直投射到每厘米6000条刻线的光栅上，最多能观察到的主极大级数是:【 】
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