影响混凝土强度和超声波传播速度间的定量关系的因素有哪些?
影响因素有：骨料的品种;粒径的大小;水泥的品种;用水量和水灰比;混凝土的龄期;测试时试件的温度和含水率。
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Thechildrenshouldgotoschoolinsteadoftosupporttheirfamilies.
Whoistheman____(你刚才在操场和他握手)?
Hisparentswouldn'tlethimmarryanyone____familywaspoor.
Marykeepstalkingabouttheparty.Shehadaverygoodtime,______she?
"Thelecturerwasatallthinmanwithwhitehair.""Thenit_______Dr.Fellbecauseheisshortandfat.It_____Dr.Jones;heisthin."
