使用电工钳剪切导线时，禁止同时剪切两根以上（）导线。 ["相同","异相","零线","任意"]
我国借用外债的基本出发点是（）。 ["引进资金，发展经济","引进资金，调节国际收支","引进资金，优化出口商品结构","引进资金，解决国内资金缺口问题"]
Critical speed in diesel engines occurs when engine torque pulsations become （） ["opposed to the crankshaft rocking couple","resonant with the crankshaft natural frequency","critical fore and aft crankshaft vibrations","horizontal whipping motions of the crankshaft"]
戴隐形眼镜会不会加深度数？
水稻上下皮表皮的主要区别是（） ["气孔数量的多少","表皮细胞的形状","有无硅质细胞","有无泡状细胞"]
汽轮机的能量损失有哪几类？各有何特点？
