钢结构二级焊缝不得有（）缺陷。 ["电弧擦伤","咬边","未焊满","根部收缩"]
Which object is added to a form module when you copy the reusable calender class?（） ["List icon ","Object group ","PL\/SQL library ","Key-Listval trigger&e"]
承载压力大的场合一般选用（）的润滑油。 ["闪点高","凝点低","粘度小","粘度大"]
Examine the following statement that is used to modify the constraint on the SALES table： SQL> ALTER TABLE SALES MODIFY CONSTRAINT pk DISABLE VALIDATE； Which three statements are true regarding the above command（） ["The constraint remains valid.","The index on the constraint is dropped.","It allows the loading of data into the table using SQL*Loader.","New data conforms to the constraint， but existing data is not checked","It allows the data manipulation on the table using INSERT\/UPDATE\/DELETE SQL statements."]
What is the result？（） ["null","finally","null finally","Compilation fails.","finally exceptio"]
表面的几何形状特征
