使用插爪式人行车,必须使用(),轨枕间都要打()。
参考答案:木轨枕;撑棒
The number of the students in our school ___________ more than 2, 000. [ ]
A. is
B. are
C. were
D. was
在我国,流动性比例、超额备付金比率及核心负债依存度分别不得低于()
A.25%,3%,60%
B.25%,2%,60%
C.25%,3%,70%
D.25%,2%,70%