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Fill in the blank with suitable prepositions or adverbs.6. This area witnessed a leap in economic growth in the past decade, but now the growth is slowing _____.

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Fill in the blank with suitable prepositions or adverbs.7. Since you don’t know much about this city, let me accompany you _____ your hotel in case you lose your way.

Fill in the blank with suitable prepositions or adverbs.8. Leaving behind their families when getting _____ the plane departing for America is their most challenging experience.

_________主要用于隔离电源和不频繁地接通和分断电路。

A. 刀开关
B. 按钮
C. 接触器
D. 继电器

________属于一种主令电器，短时接通或分断小电流电路，它不直接控制主电路的通断，而是在低压控制系统中，用于手动发出控制信号，可远距离操纵各种电磁开关（如继电器、接触器等），实现接通或断开相应的电路，以实现对各种运动的控制。

A. 刀开关
B. 按钮
C. 接触器
D. 继电器