问题
单项选择题
( )具有良好的热塑性、铸造性能和锻造性能，并有较高的机械性能，主要用于承受重荷载的锻件和模锻件。
A．硬铝合金
B．超硬铝合金
C．防锈铝合金
D．锻铝合金
答案
参考答案：D
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( )具有良好的热塑性、铸造性能和锻造性能，并有较高的机械性能，主要用于承受重荷载的锻件和模锻件。
A．硬铝合金
B．超硬铝合金
C．防锈铝合金
D．锻铝合金
参考答案：D
| 阅读理解。 | ||||
| Here are two letters to George and his replies. | ||||
| ||||
| 1. Alice is worrying about ___. | ||||
| A. her friends B. her marks C. her height D. her weight | ||||
| 2. Bob should ___ according to george's letter. | ||||
| A. take more exercise B. talk to his friends C. join a basketball team D. leam some French | ||||
| 3. Ceorge advises Alice to talk to___ for help. | ||||
| A. her mother B. her teacher C. Bob's teacher D. Bob's friends |