卸储煤设备多采用开式齿轮传动,齿轮失效的主要原因是()。
A.齿面磨损
B.应力集中
C.疲劳点蚀
D.胶合
参考答案:A
以下哪项不是氯化喹啉的副作用()
A.恶心、呕吐
B.白细胞数降低
C.视力损害
D.血压降低
E.肝功能损害
They forced ____ little children to work all day for so little money____ everyone couldn’t
bear that.
A.so; as
B.so; that
C.such; as
D.such; that