题目内容

用金属型铸造和砂型铸造来生产同一个零件毛坯,则

A. 金属型铸造时,铸造应力较大,力学性能好
B. 金属型铸造时,铸造应力较大,力学性能差
C. 金属型铸造时,铸造应力较小,力学性能差
D. 金属型铸造时,铸造应力较小,力学性能好

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缩孔最可能出现的部位是

A. 铸件最上部
B. 铸件中部
C. 在铸件最上部及热节处
D. 热节部位

倾向于产生缩松的合金成分为

A. 纯金属
B. 共晶成分合金
C. 结晶间隔大的合金
D. 共析成分合金

Book 2 Unit 4 Dance with LoveWhat is the magic of love? What can we do to find true love? What should we do when we face problems in the process of pursuing true love? These are questions that may perplex all college students. As they further mature, college students have a strong desire to talk about their feelings and their attitudes about love issues. Popular love songs and romance movies comprise a substantial part of students’ entertainment, and offer perfect opportunities for them to learn English. This unit starts by motivating students to listen and speak with a popular love song by the famous American pop music star Justin Bieber As Long as You Love Me.Listen to the song and try to fill in the missing words in the lyrics. We're under 1)__________,Seven billion people in the world trying to 2)_________Keep it together,3)_________ on your face even though your heart is 4)_____________But hey now, you know, girl,We both know it's a 5)______ worldBut I will 6)_________________________As long as you love meWe could be 7)____________, we could be 8)___________, we could be brokeAs long as you love meI'll be your platinum(铂金), I'll be your 9)__________, I'll be your 10)________As long as you love, love, love, love me (love me)As long as you love, love, love, love me (love me)I'll be your soldier,11)____________ every second of the day for your 12)________, girlI'll be your HovaYou can be my Destiny's Child on the scene,girlSo don't 13)________, don't cry, we don't need no 14)______ to flyJust take my hand(Repeat) As long as you love me

在数据库恢复时,对尚未做完的事务执行()。

A. REDO处理
B. UNDO处理
C. ABORT处理
D. ROLLBACK处理

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