混合碳四产品不合格,碳三含量偏高的原因是()。
A.脱丁烷塔回流量偏低
B.脱丁烷塔釜加热量偏高
C.脱丁烷塔进料量过大
D.低压脱丙烷塔灵敏板温度设定偏低
参考答案:D
急性细菌性痢疾表现为
A.发热伴结膜充血B.发热伴关节肿痛C.发热伴肝脾大D.发热伴咯血E.发热伴胸痛上述症状常见于下列哪种疾病
Sub-contractors should obey the contractor in information system project. When censoring sub-contractors, the supervisor mostly concerns about ().
A.Amount of subcontract
B.qualifications and abilities of sub-contractors
C.responsibilities and obligations of sub-contractors
D.the contents of the subcontract