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【简答题】
下列说法是否正确？为什么？（1）可通过热处理来明显改善灰铸铁的力学性能；（2）可锻铸铁因具有较好的塑性，故可进行锻造；（3）铸铁硬度高，可用于制造刀具；（4）因片状石墨的影响，灰铸铁的各项力学性能指标均远低于钢。
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举一反三
【单选题】听力原文：W：Why can't I make the international direct dial in my room, sir? M：Well, let me have a check. But have you paid the deposit for the telephone charge at the front desk? Q：What does the man sugges...
A.
To dial the right telephone numbers.
B.
To have the telephone repaired.
C.
To open the telephone service of the room.
D.
To remit the money to the bank.
【单选题】How does one make a long distance call to Boston?
A.
First dial 555-2121, next the area code and last the number.
B.
First dial 555-1212, next the city code and last the number.
C.
First dial 555-1212 and then the phone number.
D.
First dial 555-1212, next the area code and last the number.
【简答题】请简要写出美国风湿病学会(ACR)1997年推荐的SLE诊断标准
【单选题】All people who want to make international calls by using the pay phone need to dial the_____code first.
A.
dress
B.
security
C.
country
D.
secret
【简答题】Make sure ______________________ before you dial ;
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