慢性粒细胞白血病

A．中性粒细胞碱性磷酸酶(NAP)积分值常为“O”
B．中性粒细胞碱性磷酸酶(NAP)积分值增高
C．白血病细胞过氧化酶呈弱阳性反应
D．白血病细胞酸性磷酸酶染色为阳性且不被L-酒石酸抑制
E．幼红细胞的过碘酸-雪夫反应呈强阳性

The U.S. Bureau of Indian Affairs awarded your firm a contact to renovate an elementary school on a Navajo reservation. One contractual term, Indian preference, requires you to hire native American Laborers and subcontractors from the reservation. This is an example of which type of the following constraints

A．Socia

B．Economica

C．Environmenta

D．Lega