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【判断题】
混凝土在三向压力作用下的强度可以提高。( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
A.
venture
B.
mission
C.
commission
D.
responsibility
【多选题】According to the professor, what are two problems that can be anticipated when roads are cut into an area for mining? Click on 2 answer choices.
A.
The labor is difficult to retain.
B.
The natural landscape is damaged.
C.
The roadbeds create waste piles.
D.
The ecosystem is disturbed.
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