对于许多没有明显屈服现象的金属材料,工程上规定以试样产生()塑性变形时的应力,作为该材料的屈服点。
A.0.3%
B.0.2%
C.0.4%
参考答案:B
根据句意,用所给单词的适当形式填空。(5分)
1. Tom is looking forward to _________ (see) the park.
2. Be careful when you go __________(cross) the street.
3. Which bus ________ I _______ (take) to the post office?
4. Tom fell off the bike and _________ (hurt) his legs.
5. He wants to know if the ________(follow) answer is right.
在美国历史上,扫清了资本主义发展的又一障碍,为以后经济的迅速发展创造了条件的历史事件是 [ ]
A、美国独立战争
B、南北战争
C、西进运动
D、美国领土的扩张