加强对各种车辆维修管理。各种车辆的技术状况应符合国家规定，消防装置完善可靠。
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为什么共轭效应存在长使一些基团的振动频率较低，而诱导效应常使一些基团的振动频率增加？
来到石头城，阿卜杜拉看到有个人坐在石凳上，他的左臂上挂着金链子，链子上有（）把钥匙。
The heated feedwater entering any flash chamber of a flash-type evaporator will（）
A. vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamber
B. vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber
C. vaporize, with the remaining water at the temperature greater than it entered the flash chamber
D. boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
多元文化教育的实施需要另设有一门学科，将少数民族文化或外来文化资产纳入现有的课程中。
A. 正确
B. 错误
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