比重瓶的种类有()。 ["A、细颈","B、短颈","C、粗颈","D、长颈"]
采用卡诺热机进行制热循环,当空气温度为-5ºC,室内温度为18ºC时,最大制热系数为() ["10;","12.7;","15.5;","22.4。"]
下列不属于四轮驱动常见的形式的是() ["A、全时驱动","B、分时驱动","C、适时驱动","D、限时驱动"]
某理想气体的内能函数关系为u=125+0.125t(kJ/kg)。则定容比热为() ["0.125kJ/(kgK);","1.25kJ/(kgK);","12.5kJ/(kgK);","125kJ/(kgK)。"]
实施进近雷达管制时,进近雷达管制员应当向航空器提供()。 ["天气实况情报","最新位置报","有关最后进近的方位和相对跑道入口距离的情报","最后进近航道上航空器的数量"]
什么是中餐宴会?