齿轮联轴器的内齿轮轴向有一定的游动量以保证两轴都有（）空间。
A.存油空隙
B.受力变形
C.热胀冷缩
D.磨损
参考答案：C
With a dinning table already ____, all the guests come and sit down. [ ]
A. laid
B. laying
C. to lay
D. being laid
试述新生儿败血症的临床诊断。
