检查屏蔽泵振动（双峰值）不超过（） ["Ａ.25ｍμ","Ｂ.30ｍμ","Ｃ.35ｍμ"]
四冲程柴油机活塞运行到进气冲程与压缩冲程之间的下止点时，进气阀是（）状态，排气阀是（）状态． ["开启/开启","开启/关闭","关闭/开启","关闭/关闭"]
下面各项哪一项不是溃疡性结肠炎并发中毒性巨结肠的常见诱因（） ["低血钾","使用阿片类药物","低斑钙","全结肠镜检查","钡灌肠"]
四冲程柴油机活塞运行到排气上止点时，进气阀是（）状态，排气阀是（）状态． ["开启/开启","开启/关闭","关闭/开启","关闭/关闭"]
Crohn病侵犯肠道的深度为（） ["黏膜层","黏膜层和黏膜下层","只侵犯黏膜下层","只侵犯到肌层","可侵犯肠壁全层"]
裸子植物
