《工业废水总硝基化合物的测定气相色谱法》(GB/T4919-1985)规定,分离硝基化合物用()色谱柱。
A.QP-1
B.FFA.P
C.PEG-20M
D.SE-30
参考答案:D
Would you mind___________ the window? It is windy outside. [ ]
A. closing
B. closed
C. to close
D. closes
Romberg Sign阳性是下述哪种疾病的典型表现()
A.脑干病变
B.小脑病变
C.前庭病变
D.脊髓后角病变
E.基底部病变