在电源按三角形连接中如有（）绕组接反，就会（）绕组。

战国时各国纷纷进行变法，楚悼王用吴起为令尹、秦孝公用（）为左庶长实行变法。

---Do the people in Australia speak French?

--- ____________.

A．Yes, they are.

B．No, they aren’t.

C．Yes, they do.

D．No, they don’t.

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Although he played several musical instruments while being a child, Maestro Macintosh did not begin playing the piano until he was 23 years old.（）

A. while being a child

B. as a child

C. as in childhood

D. at the time of his childhood

E. at the time when he was a child

电子邮件服务器之间相互传递邮件通常使用的协议为( )。

A．POP3

B．SMTP

C．FTP

D．SNMP

在检查已使用的自动变速器的离合器盘片时，如果摩擦片（），就必须更换这片摩擦盘片。

A.印记尚存在

B.干燥并有拉痕

C.保存有油液

D.厚度符合、盘片偏黄