问题
单项选择题
氢氧化钙制剂的作用是（）
A.强缓冲作用
B.强抗菌作用
C.促进硬组织形成
D.抑制细菌产酸
E.激活酸性磷酸酶
答案
参考答案：C
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氢氧化钙制剂的作用是（）
A.强缓冲作用
B.强抗菌作用
C.促进硬组织形成
D.抑制细菌产酸
E.激活酸性磷酸酶
参考答案：C
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| Chang'e I, China's pioneering lunar probing (月球探测) satellite, came through its first lunar eclipse (月食) yesterday and had regained full operations. The moon orbiter was temporarily hidden from solar rays and lost 1 with Earth for two-and -half hours during a blackout that started at 10 a.m., Ye Peijian, chief commander and designer in 2 of the satellite system, said. Chang'e I had to switch off some its 3 and rely on onboard batteries during this challenging time, when it was 4 from solar energy, Ye said. Full details of how Chang'e I 5 during the eclipse were due to be released last night. Gu Shen, a deputy (副) director with the lunar probe's measurement and control system, said scientists 6 the orbit of the satellite and shortened the 7 the probe was out of direct sunlight by about 80 minutes. As of 10 pm. Wednesday, the satellite had 8 1204 orbits of the moon.Before yesterday's eclipse, the 9 time Chang's I had been without contact with the Earth was 49 minutes. The European Space Agency helped 10 the satellite, which will perform a second orbital adjustment during another eclipse in August, Ye said. | ||||
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