凭工具书识字除掌握汉语拼音外,还需要具备两方面的能力,一是(),二是()。
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在竖直角测量中照准目标后,再用竖盘微动螺旋使竖盘气泡居中才读取竖盘的读数。
A. 正确
B. 错误
Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive() the life of the ship.
A. along
B. will
C. throughout
D. for
以亲水性基团的电荷性质(或水性单体)分,水性聚氨酯可分为()、()、()。