为了行车安全平稳,列车过岔速度应有一定的限制。普通型7号道岔侧向通过最高速度为()。
A、25km/h
B、30km/h
C、35km/h
D、50km/h
参考答案:A
两位数乘两位数的积最多是四位数______.(判断对错)
—What’s your sister like?
—_______.
A.She is a worker
B.She likes pears
C.She is very thin
D.She is like her father