常出现呼吸困难伴有昏迷的疾病是()
A.急性心肌梗死
B.糖尿病酮症酸中毒
C.气胸
D.肺梗死
E.支气管哮喘
参考答案:B
—Let's go to see the animals.
—_________.[ ]
A. Right
B. That's all right
C. That's right
D. All right
磨矿分级流程的选择原则有哪些?