Based on the test results of alkali-aggregate using four cements and six aggregates, preventive effect of low alkali Portland eement on AAR is studied.是什么意思_Based on the test results of alkali-aggregate using four cements and six aggregates, preventive effect of low alkali Portland eement on AAR is studied.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句