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怎样解决PO=1?
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更多 “怎样解决PO=1?” 相关考题
考题
已知H3PO4的pKa1θ、pKa2θ、pKa3θ分别是2.12;7.20;12.4今用H3PO4和Na3PO4配制pH=7.20的缓冲溶液,H3PO4与Na3PO4的物质的量之比是()
A.1:2B.2:3C.3:2D.1:1
考题
已知H3PO4的Ka1θ=7.6×10-3,Ka2θ=6.3×10-8,Ka3θ=4.4×10-13,则在0.1mol·L-1NaH2PO4溶液中离子浓度由大至小的顺序正确的是()
A.Na+、H2PO4-、HPO42-、H3PO4、PO43-;B.Na+、H2PO4-、HPO42-、PO43-、H3PO4;C.Na+、HPO42-、H2PO4-、H3PO4、PO43-;D.Na+、HPO42-、H2PO4-、PO43-、H3PO4;
考题
Evaluatethefollowingstatements:CREATETABLEpurchase_orders(po_idNUMBER(4),po_dateTIMESTAMP,supplier_idNUMBER(6),po_totalNUMBER(8,2),CONSTRAINTorder_pkPRIMARYKEY(po_id))PARTITIONBYRANGE(po_date)(PARTITIONQ1VALUESLESSTHAN(TO_DATE(?1-apr-2007?d-mon-yyyy?),PARTITIONQ2VALUESLESSTHAN(TO_DATE(?1-jul-2007?d-mon-yyyy?),PARTITIONQ3VALUESLESSTHAN(TO_DATE(?1-oct-2007?d-mon-yyyy?),PARTITIONQ4VALUESLESSTHAN(TO_DATE(?1-jan-2008?d-mon-yyyy?));CREATETABLEpurchase_order_items(po_idNUMBER(4)NOTNULL,product_idNUMBER(6)NOTNULL,unit_priceNUMBER(8,2),quantityNUMBER(8),CONSTRAINTpo_items_fkFOREIGNKEY(po_id)REFERENCESpurchase_orders(po_id))PARTITIONBYREFERENCE(po_items_fk);Whatarethetwoconsequencesoftheabovestatements?()
考题
Usingoutputfrom"vmstat28,"whichofthefollowingoptionsismostappropriatetoconsiderwhendeterminingifasystemisexperiencingmemorythrashing?()
A.cy!=1B.re!=0C.po/fr1/6D.fr/po1/6
考题
以下哪两个PO号是伟创力日常使用的号码?()A、PO:1104704666PO:J1AB15699B、PO:2204704666PO:T1AB15699C、PO:3304704666PO:S1AB15699
考题
Using output from "vmstat 2 8," which of the following options is most appropriate to consider when determining if a system is experiencing memory thrashing?()A、 cy != 1 B、 re != 0 C、 po/fr 1/6 D、 fr/po 1/6
考题
0.1mol·L-1H3PO4溶液中,其各物种浓度大小次序正确的是()。A、H3PO4〈H2PO4-〈HPO42-〈PO43-B、PO43-〈HPO42-〈H2PO4-〈H3PO4C、H+〉H3PO4〉H2PO4-〉HPO42-D、H3PO4〉H2PO4-〉HPO42-〉H+
考题
H3PO4的pKa1,pKa2,pKa3分别是2.12,7.20,12.40,当H3PO4溶液的pH=7.80时,溶液中的存在形式的浓度大小,正确的是()A、[H2PO4-]>[HPO42-]B、[HPO42-]>[H2PO4-]C、[H2PO4-]<[HPO42-]D、[PO43-]>[HPO42-]
考题
H3PO4的pKa1,pKa2,pKa3分别是2.12,7.20,12.40,当H3PO4溶液的pH=6.20时,[HPO42-]:[H2PO4-]是()A、10:1B、1:5C、1:2D、1:10
考题
H3PO4的pKa1,pKa2,pKa3分别是2.12,7.20,12.40,当H3PO4溶液的pH=7.20时,溶液中的主要存在形式是()A、H2PO4-和HPO42-B、H2PO4-C、HPO42-D、HPO42-和PO43-
考题
标准方案:卡培他滨的用法用量正确的是哪个?()A、1000mg/m2 po Bid d1-14,每21天重复B、800mg/m2 po Bid d1-14,每21天重复C、600mg/m2 po Bid d1-14,每21天重复D、400mg/m2 po Bid d1-14,每21天重复
考题
H3PO4的pKa1,pKa2,pKa3分别是2.12,7.20,12.40,欲用H3PO4和NaOH配制pH=2.12的缓冲溶液时,应使用H3PO4和NaOH的物质的量之比为:()A、1:1B、1:2C、2:1D、2:3
考题
单选题Using output from "vmstat 2 8," which of the following options is most appropriate to consider when determining if a system is experiencing memory thrashing?()A
cy != 1 B
re != 0 C
po/fr 1/6 D
fr/po 1/6
考题
单选题王水的成分为( )。A
HNO3+H2SO4(1∶3)B
HNO3+H3PO4(1∶3)C
HCl+H2SO4(1∶3)D
HNO3+HCl(1∶3)E
HCl+H3PO4(1∶3)
考题
单选题氯化磷酸三钠的分子式为( )。A
Na3PO4·1/4NaOCl·12H2OB
Na3PO4·1/4NaOCl·10H2OC
Na3PO4·1/4NaOCl·8H2OD
Na3PO4·1/4NaOCl·6H2OE
Na3PO4·1/4NaOCl·4H2O
考题
单选题牙釉质的矿物盐是以结晶形式存在()A
Ca10(PO4)5(OH)2B
Ca10(PO1)6(OH)2C
Ca8(PO4)6(OH)2D
Ca8(PO4)5(OH)2E
Ca10(PO4)3(OH)2
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