在测定硬度时,若有铁离子干扰,应采用()消除干扰。
A.络合掩蔽法
B.沉淀掩蔽法
C.控制溶液的pH值
D.解蔽法
参考答案:A
All the organizations concerned have made an urgent __________ to the government, asking for extra funding to help the earthquake victims.[ ]
A. promise
B. assessment
C. appeal
D. adjustment
外科急腹症不需与下列妇科疾病进行鉴别诊断的是()
A.卵巢囊肿蒂扭转
B.急性盆腔炎
C.慢性盆腔炎
D.异位妊娠或卵巢黄体破裂出血
E.急性化脓性输卵管炎