单项选择题

迷走神经司理咽、喉的感觉和运动，神经核在延髓。
A、正确
B、错误

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单项选择题

A sample of potassium chlorate (15.0 g) is dissolved in 201 g of water at 70 °C with precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 °C and no precipitate is observed. This solution is __________.

A．hydrated
B．miscible
C．saturated
D．unsaturated
E．supersaturated

单项选择题

Consider each fiber has a core diameter of 50 μm, if the two fibers have an axial misalignment of 5 μm, what is the insertion loss at the joint?
A、0.590 dB
B、- 0.590 dB
C、0.873dB
D、- 0.873dB