一对双面水准尺的红、黑面的零点差应为_______、__________。
普通水准测量,应在水准尺上读取________位数。
对高程测量,用水平面代替水准面的限度是________。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
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