I would go with answer choice A).
Answer:
create trigger F1_Del
after delete on Friend
for each row
when exists (select * from Friend
where ID1 = Old.ID2 and ID2 = Old.ID1)
begin
delete from Friend
where (ID1 = Old.ID2 and ID2 = Old.ID1);
end
create trigger F1_Insert
after insert on Friend
for each row
when not exists (select * from Friend
where ID1 = New.ID2 and ID2 = New.ID1)
begin
insert into Friend values (New.ID2, New.ID1);
end
Answer:
tech A only
Explanation:
Technician A is right because a cracked exhaust manifold allows more oxygen into the exhaust stream, which affects oxygen sensor voltage. Technician B is wrong because a clogged air filter raises Hydrocarbons (HC) and also affects O2 (Oxygen) and CO (Carbon Monoxide) levels.
Answer:
The correct option is option b.
Explanation:
rem stands for Root Em which indicates that the value of Em defined in the HTML level becomes the standard unit and thus all the alternatives are used that the new value of font is the multiple of the standard Em defined in the HTML part of the code. Thus the correct definition is the font size specified in the HTML top level heading which becomes the standard to be used further.
