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【单选题】
称取含磷样品0.2000g,溶解后把磷沉淀为MgNH4PO4,此沉淀过滤洗涤再溶解,最后用0.02000mol/L的EDTA标准溶液滴定,消耗30.00mL,样品中P2O5的百分含量为()。已知M(MgNH4PO)4)=137.32g/mol,M(P2O5)=141.95g/molA.
42.59%
B.
41.20%
C.
21.29%
D.
20.60%
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举一反三
【单选题】II型呼吸衰竭时,其血气分析检查的结果是
A.
PaO2≤50mmHg，PaCO2正常
B.
PaO2≥50mmHg，PaCO2正常
C.
PaO2≤50mmHg，PaCO2≥50mmHg
D.
PaO2≥50mmHg，PaCO2≥50mmHg
E.
PaO2≥50mmHg，PaCO2≤50mmHg
【单选题】To teach students writing effectively, teachers may guide students through the writing process as follows: 1mapping 2editing 3outlining 4brainstorming 5free writing 6drafting
A.
①④③⑤⑥②
B.
④③⑤①⑥②
C.
④①③⑤⑥②
D.
③①④⑥⑤②
【简答题】简述取得时效和诉讼时效(即消灭时效)的区别。
【简答题】完形填空。 Kate's father and mother 1 teachers. They teach 2 the same school. They go to school 3 their bikes at seven in the 4 , and they go 5 at five in the afternoon.Kate and 6 brother, Jack are 7 stude...
【单选题】我国MFC信令是
A.
前向、后向信令均采用六中取二编码
B.
前向、后向信令均采用四中取二编码
C.
前向信令采用六中取二，后向信令采用四中取二编码
D.
前向信令采用四中取二，后向信令采用六中取二编码
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