下列不是寄生虫对宿主的作用是()
A、机械性损害
B、夺取宿主的营养
C、引入其他病原微生物
D、人生互利关系E、毒素及有毒产物的影响
参考答案:D
When he realized the police had seen him, the man_____the exit as quickly as possible.
A.made up
B.made for
C.made out
D.made off
系统高压氮气线阀门公称压力有三种:()MPa、()和()MPa。