对路基产生“弹簧”且急于赶工的路段，可以采取（）的措施。
A. 增大压实机具功率
B. 掺生石灰粉翻拌
C. 适量洒水
D. 掺碎石翻拌
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什么是助磨剂？对助磨剂有什么要求？简述助磨剂的助磨机理。
IS—LM模型是说明（）与（）同时达到均衡时， 国内生产总值与利率决定的模型。
Which statement about satellite navigation is TRUE? （）
A. While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B. The satellites are in equatorial orbits around the earth about 60°of longitude apart
C. The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D. The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
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