润滑剂有哪几种类型?
参考答案:
①液体润滑剂;
②半液体润滑剂;
③固体润滑剂;
④气体润滑剂四种类型。
Since her father could not drive her to the airport, she requested her uncle to drive her instead.
A.take
B.bring
C.dispatch
D.deliver
引起呼吸衰竭的疾病最常见的是()
A.肺炎
B.肺结核
C.自发气胸
D.慢性阻塞性肺疾病
E.肺癌