往复式压缩机润滑方法有哪些?
参考答案:
①飞溅法;
②压力润滑法。
— Did the boy see _____ tigers in the zoo?
— Yes, he saw _____. [ ]
A. some; some
B. any; some
C. some; any
气管插管可以引起除下列那种之外的各种反射
A、咳嗽反射
B、吞咽反射
C、呕吐反射
D、膝健反射