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表面张力的影响因素有( )
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Read the following statements and then decide whether each of them is true or false based on the information in the text.1) Recently, the family had picnics and gatherings quite often under the pine tree in the park.
The writer occasionally visited the pine tree after her mother's death because she missed her mother.
汽车制动系统的功用是________、_________、可靠驻车。
制动系统的基本组成包括哪些?
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