Friendships are hard to survive in a ____social environment.
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Some conflicts due to ____can cause the end of friendships.
In recent years, we have invested more in basic science, but I think the investment ratio is still____.
The ____between consumption and investment must be corrected in order to achieve sustained economic growth.
常开触点也称动合触点,在常态下断开,动作时闭合。
A. 对
B. 错