填空题我国规定氨()的PK/PO≦8。
填空题
我国规定氨()的PK/PO≦8。
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以下溶液的浓度均为0.10mol/L,其中只能按一元酸碱被直接准确滴定的是( ) A. 草酸(pK1=1.22,pK2=4.19)B. 联氨(pKC. 1=5.52,pKD. 2=14.12)E. 硫化钠(pKF. 1=-0.92,pKG. 2=6.76)H. 亚硫酸(pK1=1.90,pK2=7.20)
患者,男,50岁,诊断为高血压、冠心病。医师处方:氨氯地平片10mg po qd;美托洛尔缓释片47.5mg po qd;贝那普利片20mg po qd;阿司匹林肠溶片100mg po qd;辛伐他汀片40mg po qd。该患者化验结果同时显示血钾6.1 mmol/L,需要调整的药物是( )A.氨氯地平片B.美托洛尔缓释片C.贝那普利片D.阿司匹林肠溶片E.辛伐他汀片
按照抗菌药物PK/PD理论,下列给药方案中,错误的是()A.注射用青霉素钠480万单位ⅳ,q8hB.莫西沙星片0.4gpo,B.iD.C.注射用美罗培南1g,ⅳV,q8hD.阿奇霉素片0.5 g, po: qD.E.注射用头孢曲松钠1g,VqD.
已知H3PO4的pKθa1=2.0,pKθa2=7.2,pKθa3=12.6,用磷酸盐配制缓冲溶液时,若选用Na2HPO4作为酸,可配成pH在()范围的缓冲溶液;若选用Na2HPO4作为碱,可配制成pH在()范围的缓冲溶液。
PO_DETAILS表包含以下列: PO_NUM NUMBER NOT NULL, Primary Key PO_LINE_ID NUMBER NOT NULL, Primary Key PRODUCT_ID NUMBER Foreign Key to PRODUCT_ID column of the PRODUCTS table QUANTITY NUMBER UNIT_PRICE NUMBER(5,2) 请评估以下语句: ALTER TABLE po_details DISABLE CONSTRAINT po_details_pk CASCADE;此语句用于完成什么任务()A、新创建一个对PO_NUM列的PRIMARYKEY约束条件B、删除并重新创建对PO_NUM列的PRIMARYKEY以及FOREIGNKEY的约束条件C、禁用依赖于PO_NUM列的所有FOREIGNKEY约束条件D、禁用对PO_NUM列的约束条件,同时创建PRIMARYKEY索引
配制pH=5左右的缓冲溶液,应选用下列体系为?()A、Na2B4O7═HCl,pK1=9.24B、NaH2PO4═Na2HPO4,pK2=7.2C、HAc═NaAc,pKa=4.74D、CH2ClCOOH═NaOH,pKa=2.85
要配制pH=4.0的缓冲溶液,应选用()。A、NaH2PO4--Na2HPO4(pKα1θ=2.12,pKα2θ=7.20)B、HCOOH--HCOONa(pKαθ=3.74)C、HAC--NaAC(pKαθ=4.74)D、NaHCO3--Na2CO3(pKα1θ=6.38,pKα2θ=10.25)
单选题PO_DETAILS表包含以下列: PO_NUM NUMBER NOT NULL, Primary Key PO_LINE_ID NUMBER NOT NULL, Primary Key PRODUCT_ID NUMBER Foreign Key to PRODUCT_ID column of the PRODUCTS table QUANTITY NUMBER UNIT_PRICE NUMBER(5,2) 请评估以下语句: ALTER TABLE po_details DISABLE CONSTRAINT po_details_pk CASCADE;此语句用于完成什么任务()A新创建一个对PO_NUM列的PRIMARYKEY约束条件B删除并重新创建对PO_NUM列的PRIMARYKEY以及FOREIGNKEY的约束条件C禁用依赖于PO_NUM列的所有FOREIGNKEY约束条件D禁用对PO_NUM列的约束条件,同时创建PRIMARYKEY索引
单选题配制pH=5左右的缓冲溶液,应选用下列体系为?()ANa2B4O7═HCl,pK1=9.24BNaH2PO4═Na2HPO4,pK2=7.2CHAc═NaAc,pKa=4.74DCH2ClCOOH═NaOH,pKa=2.85
单选题现要配制pH=4.5的缓冲溶液,最理想的缓冲对是()。ANaH2PO4-Na2HPO4(pK(H2PO4-)=7.21)BHAc-NaAc(pK(HAc)=4.76)CHCOOH-HCOONa(pK(HCOOH)=3.75)DNH3-NH4Cl(pK(NH3)=4.75)
多选题Evaluate the following statements: CREATE TABLE purchase_orders (po_id NUMBER(4), po_date TIMESTAMP, supplier_id NUMBER(6), po_total NUMBER(8,2), CONSTRAINT order_pk PRIMARY KEY(po_id)) PARTITION BY RANGE(po_date) (PARTITION Q1 VALUES LESS THAN (TO_DATE(?1-apr-2007?d-mon-yyyy?), PARTITION Q2 VALUES LESS THAN (TO_DATE(?1-jul-2007?d-mon-yyyy?), PARTITION Q3 VALUES LESS THAN(TO_DATE(?1-oct - 2007?d-mon-yyyy?), PARTITION Q4 VALUES LESS THAN (TO_DATE(?1-jan-2008?d-mon-yyyy?)); CREATE TABLE purchase_order_items (po_id NUMBER(4) NOT NULL, product_id NUMBER(6) NOT NULL, unit_price NUMBER(8,2), quantity NUMBER(8), CONSTRAINT po_items_fk FOREIGN KEY (po_id) REFERENCES purchase_orders(po_id)) PARTITION BY REFERENCE(po_items_fk); What are the two consequences of the above statements?()APartitions of PURCHASE_ORDER_ITEMS have system-generated names.BBoth PURCHASE_ORDERS and PURCHASE_ORDER_ITEMS tables are created with four partitions each.CPartitions of the PURCHASE_ORDER_ITEMS table exist in the same tablespaces as the partitions of the PURCHASE_ORDERS table.DThe PURCHASE_ORDER_ITEMS table inherits the partitioning key from the parent table by automatically duplicating the key columns.EPartition maintenance operations performed on the PURCHASE_ORDER_ITEMS table are automatically reflected in the PURCHASE_ORDERS table.
单选题牙釉质的矿物盐是以结晶形式存在()ACa10(PO4)5(OH)2BCa10(PO1)6(OH)2CCa8(PO4)6(OH)2DCa8(PO4)5(OH)2ECa10(PO4)3(OH)2