经济指标中的滞后指标主要有货币供应量、股票价格指数等。 ( )
参考答案:错
The boy was born ______ the 3rd of July,1989. [ ]
A. in
B. on
C. at
电梯层门的预留孔应设有高度不小于()m的安全保护围封,并保证有足够的机械强度。
A.1
B.1.2
C.1.4
D.1.6