The re-examination results indicate that one-third of the goods are not()standard.

The re－examination results indicate that one－third of the goods are no（)standard.A. up

The re－examination results indicate that one－third of the goods are not（) standard.

HENRY: Good afternoon! Lucy, I am telling you something urgent. We have found several cases of golden staph infected in our patients. They were caused by your products.

LUCY: Are you sure？ Our bandages are very safe.{A; B; C; D; E}.

HENRY: I know that. But only patients who have used your bandages are infected.

LUCY: All of our products were made with the utmost care.{A; B; C; D; E}. And why didn’t you put the bandages into the sterilizer before you used them？

HENRY: Lucy,{A; B; C; D; E}. I’ve already asked the hospital to do a re-examination of your supplies right now.

LUCY: Henry, you’re making things difficult.

HENRY: The safety of our patients is most important,{A; B; C; D; E}.

LUCY: But I have already posted your recent order. They are now on the way.

HENRY: Sorry, Lucy. As soon as they arrive,{A; B; C; D; E}.

A. May be they were polluted in your hospital.

B. so I will stop all orders with your company.

C. This is the first time we’ve received a complaint of this nature.

D. they will be returned to your factory immediately.

E. it’s your job to do that, not ours.

R是二元关系，且R=RºRºRºRº，那么下面哪一个不一定是传递的？

电阻R

若r（AB)=r（AC)，则r（B)=r（C)。

若r（AB)=r（AC)，则r（B)=r（C)。

R是二元关系，且R=RºRºRºRº，那么下面哪一个不一定是传递的？

集合A={a1，a2，a3，a4}，R={（a1，a2)，（a2，a3)，（a3，a4)}，求r（s（R))，s（r（R))，t（s（R))，r（t（R))，t（r（R))。

7、若r（AB)=r（AC)，则r（B)=r（C)。