简述轴与孔的液压套合法。
关于独立离椅子站立，下列描述中正确的是（） 椅子坐垫软些较好。 椅子高些较容易站立。 站立前尽量坐于椅子后方。 站立前力量较强的足靠前。 椅子矮些较容易站立。
View the following SQL statements： Transaction T1 INSERT INTO hr.regions VALUES （5，’Pole’）；COMMIT； Transaction T2 UPDATE hr.regions SET region_name=’Poles’ WHERE region_id = 5； COMMIT； Transaction T3 UPDATE hr.regions SET region_name=’North and South Poles’ WHERE region_id = 5； You want to back out transaction T2. Which option would you use？（） It is possible，but transaction T3 also backs out.。 It is possible with the NOCASCADE_FORCE option.。 It is possible with the NONCONFLICT_ONLY option.。 It is not possible because it has conflicts with transaction T3.。
Which built-in allows you to update the screen display to reflect the information that Forms has in its internal representation of the screen? （） SYNCHRONIZE 。 UPDATE_FORM 。 SYNCHRONIZE_FORM 。 GET_MEMORY_DISPLAY 。 SET_MEMORY_DISPLAY。
You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.Which statement accomplishes this task?（） ALTER TABLE students ADD PRIMARY KEY student_id;。 ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student _ id);。 ALTER TABLE students ADD CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);。 ALTER TABLE students MODIFY CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id)。
Oracle Fusion Middleware Control runs as：（）
