Examine the code： CREATE ROLE readonly IDENTIFIES USING app.chk_readwrite ； CREATE ROLE readwrite IDENTIFIED USING app.chk_readwrite ； CREATE OR REPLACE PROCEDURE app.chk_readwrite AUTHID CURRENT_USER IS ipchk STRING（30）； BEGIN IF sys_context（‘USERENV’，’ISDBA’）=’TRUE’ THEN DBMS_SESSION.SET_ROLE‘READWRITE’） ； ELSE DBMS_SESSION.SET_ROLE（‘READONLY’） ； END； / Which three statements correctly describe the Secure Application role definition？（） ["No user or application has to remember or hide a password. ","It prevents everyone except a true DBA session from acquiring the READWRITE role. ","app.chk_readwrite is called whenever a user tries to access rows protected by the READONLY or READWRITE label. ","app.chk_readwrite is called by users or applications when they want to enable the READONLY or READWRITE role."]
为患者梳头时，遇头发打结不易梳理，可用何种溶液湿润后再梳理：（） ["30％乙醇","生理盐水","70％乙醇","油剂","自来水"]
门静脉高压症形成后首先出现的病理改变是（） ["腹水","脾大","肝大","交通支扩张","呕血"]
一般护理记录单需连续记录三天新入院患者的病情变化。
理想条件下，当一国的财政边际支出（）边际收入时，所确定的税率为最佳税率。 ["大于","小于","等于","不确定"]
固相反应中，颗粒尺寸可改变反应（）、（）以及颗粒（）。
