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单项选择题
陶瓷基复合材料的复合目的是()。
A.增强
B.增韧
C.增重
D.减重
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判断题
在大范围的冷暖空气交汇区,由于暖空气在冷空气的上面缓慢爬升,形成了由高到低的卷云、卷层云、高层云和雨层云。
单项选择题
Not only have they produced higher stock returns, but their stock values and cash flows have been less volatile.
What does the underlined word "volatile" probably mean?
A、stable
B、solid
C、fluctuating
D、unalterable
单项选择题
Many enterprises and research institutes provide free coffee shops, the main purpose of this setting is() A.
Form informal organizations B.
Facilitate information exchange C.
Enhance corporate cohesion D.
Give employees a place to relax
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