为什么红色手轮阀门不适用于油类管道?
参考答案:
因为红手轮阀门是用铜做的密封圈,而油类中含有对铜有腐蚀作用的介质,易造成泄漏。
Almost 90% of the most popular video games contain violence, and ________ of it is extremely violent.
A.nothing
B.much
C.none
D.many