抽水试验根据抽水顺序可分为()抽水和()抽水试验。
参考答案:正向;反向
Thanks to Mr. Smith the father and the son eventually________after ten years' cold relationship
between them . [ ]
A. took up
B. made up
C. looked up
D. turned up
合成单元汽包副产蒸汽并网时,要求()。
A、管线暖管
B、管线充压
C、管线置换
D、蒸汽放空