钢丝绳部分被压扁是由于（）造成的。
A、机械事故
B、滑轮绳槽
C、排列不整
参考答案：A
Oh, my homework is _____ and I'm _____ tired now. [ ]
A. much too; too much
B. too much; much too
C. much too; much too
D. too much; too much
下列物质中，既能与稀盐酸反应，又能与氢氧化钠溶液反应的是
A．Cu
B．SiO2
C．AI(OH)3
D．CaCO3
