慢性小量消化道出血显像应该采用哪种显像剂()。
A. 99mTcO4-
B. 99mTc-(V)-DMSA
C. 99mTc-RBC
D. 99mTc-EHIDA
E. 99mTc-硫胶体
计算题:现阶段,对数字电视发射机而言,传送一套模拟视频信号,要先进行A/D转换,若我们按照4:2:2标准进行分量编码,亮度抽样频率为13.5MZ,每个样值按8bit线性量化,且不考虑信道编码中添加的冗余,频谱利用率设为每赫兹2(b/s),请你计算出传送这样一套电视节目所需的射频带宽为多少MHZ?
A sequence was created with the DDL statement shown below:CREATE SEQUENCE my_seq START WITH 5 INCREMENT BY 5 CACHE 5 User1 successfully executes the following statements in Connection1: VALUES NEXT VALUE FOR my_seq INTO :con1hvar VALUES NEXT VALUE FOR my_seq INTO :con1hvar User2 successfully executes the following statement in Connection2: VALUES NEXT VALUE FOR my_seq INTO :con2hvar After User1 & User2 are finished, User3 executes the following statement in Connection3: SELECT NEXT VALUE FOR my_seq FROM sysibm.sysdummy1Which value will be returned by the query?()
A. 20
B. 25
C. 50
D. 55
液化石油气瓶的规格型号较多,但都是采用()。
A. 无缝结构;
B. 焊接结构;
C. 低温绝热结构;
D. 缠绕结构