In order to find out how many database objects a user has created, which view would the DBA query in the Oracle data dictionary? ()
第1题:
慢性阻塞性肺气肿的血气特征是
A.Fi+0.50,Pa+300mmHg,PaC+30mmHg
B.Fi+0.50,Pa+92mmHg,PaC+54mmHg
C.Fi+0.50,Pa+63mmHg,PaC+28mmHg
D.Fi+0.50,Pa+380mmHg,PaC+40mmHg
E.Fi+0.50,Pa+180mmHg,PaC+74mmHg
第2题:
用动态规划方法求解0/1背包问题时,将“用前i个物品来装容量是X的背包”的0/1背包问题记为 KNAP(1,i,X),设fi(X)是KNAP(1,i,X)最优解的效益值,第j个物品的重量和放入背包后取得效益值分别为Wj和巧Pj(j=1~n)。则依次求解f0(X)、f1(X)、…、fn(X)的过程中使用的递推关系式为(58)。
A.fi(X)=min{fi-1(X),fi-1(X)+pi}
B.fi(X)=min{fi-1(X),fi-1(X-wi)+pi}
C.fi(X)=max{fi-1(X),fi-1(X-wi)+pi}
D.fi(X)=max{fi-1(X-wi),fi-1(X)+pi}
第3题:
超外差收音机中,本振频率Fl,高频信号频率FC,中频信号频率Fi之间的正确关系是()。
A.Fi=FC-Fl
B.Fi=Fl-FC
C.Fl=FC-Fi
D.Fl=Fi-FC
第4题:
电流、电压互感器与单相有功表合用时,互感器的合成误差为)()(电流互感器比差为fI,角差为α,电压互感器比差为fU,角差为β)。
第5题:
第6题:
The ORDERS table has these columns:ORDER_ID NUMBER(4) NOT NULLCUSTOMER_ID NUMBER(12) NOT NULLORDER_TOTAL NUMBER(10,2)The ORDERS table tracks the Order number, the order total, and the customer to whom the Order belongs.Which two statements retrieve orders with an inclusive total that ranges between 100.00 and 2000.00 dollars? ()
A. SELECT customer_id, order_id, order_total FROM orders RANGE ON order _ total (100 AND 2000) INCLUSIVE;
B. SELECT customer_id, order_id, order_total FROM orders HAVING order _ total BETWEEN 100 and 2000;
C. SELECT customer_id, order_id, order_total FROM orders WHERE order _ total BETWEEN 100 and 2000;
D. SELECT customer_id, order_id, order_total FROM orders WHERE order_total>= 100 and <= 2000;
E. SELECT customer_id, order_id, order_total FROM orders WHERE order_total>= 100 and order_total <= 2000;
第7题:
第8题:
ARDS的血气特征是
A.Fi+0.50,Pa+300mmHg,PaC+30mmHg
B.Fi+0.50,Pa+92mmHg,PaC+54mmHg
C.Fi+0.50,Pa+63mmHg,PaC+28mmHg
D.Fi+0.50,Pa+380mmHg,PaC+40mmHg
E.Fi+0.50,Pa+180mmHg,PaC+74mmHg
第9题:
诊断ALI时应( )
APaO2/Fi0>300
B200
C200
DPaO2/Fi0<200
EPaO2/Fi0<100
第10题:
FI202=FIC103+FI109