下述电离源中分子离子峰最弱的是?( ) A.
电喷雾电离 B.
大气压化学电离 C.
电子轰击电离 D.
化学电离

单项选择题Which statement correctly reflects the free market view of business social responsibility? A. In addition to making a profit, businesses are just as responsible for seeing to the well-being of their employees and the communities in which they operate B. No one other than the managers and owners of a business may claim to have any stake in the business decisions managers make. C. In the process of providing goods and services to customer who need and want them and maximizing profits for its shareowners, a business fulfills its social responsibility D. A business is responsible for maximizing profits for its shareowners, but, in special circumstances, may have to sacrifice profits in the interest of the community whose citizens depend on it for employment.

单项选择题玉米在贮存过程中要求水分含量必须小于（ ）。 A、14% B、16% C、18% D、20%