叠层笼养鸡舍中,机械通风时,笼具遮挡可导致风速下降()%。
A、5~10
B、10~15
C、15~20
D、20~25
参考答案:A
依据《进一步规范机电产品国际招标活动有关规定》中的相关规定,凡参加重大装备自主化依托工程等国家项目评审工作的专家,需经( )审核后入库。
A.国务院有关主管部门
B.政府有关主管部门
C.建设行政主管部门
D.政府有关财政主管部门
Advertisement: We at Vesuvius Vacuums always give our customers what they deserve, and they deserve the very best. That’s why we use only SuperTec air filters. Which of the following, if true, would most undermine the argument expressed in the advertisement ?()
A. In a test of three leading air filters, the SuperTec air filter performed at the same level as one of the filters and at a higher level than the other.
B. The SuperTec air filter is the only kind of air filter that will fit in the model of vacuum sold by Vesuvius Vacuums.
C. In a national study by a prominent consumer group, Vesuvius Vacuums gained a "superior" rating for product quality.
D. The customers of Vesuvius Vacuums have expressed no preferences concerning the type of air filter used in the product.
E. The specific air filter used in a given vacuum makes only a small difference in the long-term performance of that vacuum.