0.8×0.34×1.25=0.8×1.25×0.34 这是根据[ ]
A.乘法分配律
B.加法交换律
C.乘法结合律
D.乘法交换律
答案:D
The coal miners in the coal mine for 10 hours before we came to their rescue.
A.had trapped
B.had been trapping
C.had been trapped
D.would have been trapped
关于德国鲁尔区工业区位条件的错误叙述是 [ ]
A、丰富的铁矿资源
B、丰富的煤炭资源
C、充足的水源
D、便捷的水陆交通