根据生产任务、工人劳动效率和出勤率来计算定员人数的方法属于()。
A. 按机器设备定员
B. 按比例定员
C. 按劳动效率定员
D. 按岗位定员
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对于高级人才和尖端人才，比较适台的招聘渠道是()。
A. 人才交流中心
B. 猎头公司
C. 校园招聘广告
D. 网络招聘
The change of alert colors from amber to red implies that ______.
A. all poultry workers must leave their working places as soon as possible.
B. the officials in the Department of Health must call for much more of international assistance.
C. the most serious situation of bird-flu has appeared.
D. the change of the color functions greatly as the weather reports do.
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