29.对喉的叙述,正确的是
A. 环状软骨不参与喉的构成
B. 喉的前面紧邻舌骨上、下肌群
C. 喉肌属平滑肌
D. 是上呼吸道的一部分
E. 舌骨参与构成喉的支架
Most of the old buildings in Europe were destroyed in the Second World War, but the grand buildings that their forefathers built in Shanghai have survived.
A. 对
B. 错
Shanghai Customs Building was built in 1927. The clock on top of the building strikes every 50 minutes.
A. 对
B. 错
二次回路中,TV或YH表示( )。
A. 断路器
B. 电压互感器
C. 电流互感器
D. 熔断器