尖轨尖端与尖轨跟端轨距的差数,直尖轨应在尖轨全长范围内均匀递减,曲尖轨按标准图或设计图办理。
参考答案:对
根据短文内容,判断正(√)误(×)。
Ann comes from Canada. She is Canadian. She speaks English. She can also speak a little Chinese. She is in
Beijing now. She is studying in No. 14 Middle School. She has classes from Monday to Friday. On Saturdays
she likes playing ping-pong with her friends. Her mother is working in Beijing. She teaches English. Ann and her
mother like Chinese food. They think Chinese people are very friendly (友好的) to them.
( ) 1. Ann is a middle school student in China.
( ) 2. She has no classes on Saturdays.
( ) 3. She can't speak Chinese.
( ) 4. Her father is teaching English.
( ) 5. Ann likes Chinese food, but her mother doesn't like it.
压力表选择时,应在满足生产要求的情况下尽可能选精度(),价廉耐用的。
A、最高
B、较高
C、较低
D、一般